Simplify running pylint

This commit does several things:

- Setup and run pylint directly rather than running
  through a script. This allows the user to see what is happening
  while the user is running through pylint.
- Allow the user to either run pylint on a particular changeset,
  or the entire cinder tree.
- Allow the user to run on a particular changeset. Using like
  HEAD~1, etc.
- Since the pylint gate check I disabled the tests that were
  reported by pylint. The thought here would be go through
  the failures and correct them.
- Update pylint to 2.1.1.
- Removed old pylintrc.

Change-Id: I708c93843d991e8c0ac114b0b2d6ede373b96d0a
Signed-off-by: Chuck Short <chucks@redhat.com>

.pylintrc

@@ -0,0 +1,231 @@
+[MASTER]
+
+# A comma-separated list of package or module names from where C extensions may
+# be loaded. Extensions are loading into the active Python interpreter and may
+# run arbitrary code.
+extension-pkg-whitelist=
+
+# Add files or directories to the blacklist. They should be base names, not
+# paths.
+ignore=CVS,tests,test
+
+# Add files or directories matching the regex patterns to the blacklist. The
+# regex matches against base names, not paths.
+ignore-patterns=
+
+# Python code to execute, usually for sys.path manipulation such as
+# pygtk.require().
+#init-hook=
+
+# Use multiple processes to speed up Pylint. Specifying 0 will auto-detect the
+# number of processors available to use.
+jobs=1
+
+# Control the amount of potential inferred values when inferring a single
+# object. This can help the performance when dealing with large functions or
+# complex, nested conditions.
+limit-inference-results=100
+
+# List of plugins (as comma separated values of python modules names) to load,
+# usually to register additional checkers.
+load-plugins=
+
+# Pickle collected data for later comparisons.
+persistent=yes
+
+# Specify a configuration file.
+#rcfile=
+
+# When enabled, pylint would attempt to guess common misconfiguration and emit
+# user-friendly hints instead of false-positive error messages.
+suggestion-mode=yes
+
+# Allow loading of arbitrary C extensions. Extensions are imported into the
+# active Python interpreter and may run arbitrary code.
+unsafe-load-any-extension=no
+
+
+[MESSAGES CONTROL]
+
+# Only show warnings with the listed confidence levels. Leave empty to show
+# all. Valid levels: HIGH, INFERENCE, INFERENCE_FAILURE, UNDEFINED.
+confidence=
+
+# Disable the message, report, category or checker with the given id(s). You
+# can either give multiple identifiers separated by comma (,) or put this
+# option multiple times (only on the command line, not in the configuration
+# file where it should appear only once). You can also use "--disable=all" to
+# disable everything first and then reenable specific checks. For example, if
+# you want to run only the similarities checker, you can use "--disable=all
+# --enable=similarities". If you want to run only the classes checker, but have
+# no Warning level messages displayed, use "--disable=all --enable=classes
+# --disable=W".
+disable=
+# "F" Fatal errors that prevent further processing
+ import-error,
+# "I" Informational noise
+ locally-disabled,
+ c-extension-no-member,
+# "E" Error for important programming issues (likely bugs)
+ access-member-before-definition,
+ bad-super-call,
+ no-member,
+ no-method-argument,
+ no-name-in-module,
+ no-self-argument,
+ no-value-for-parameter,
+ unsubscriptable-object,
+ method-hidden,
+ not-callable,
+ keyword-arg-before-vararg,
+ too-many-function-args,
+ unsupported-assignment-operation,
+ misplaced-bare-raise,
+ not-an-iterable,
+ unsupported-membership-test,
+ unsupported-assignment-operation,
+ raising-bad-type,
+ bad-option-value,
+ unexpected-keyword-arg,
+ assignment-from-none,
+ assignment-from-no-return,
+# "W" Warnings for stylistic problems or minor programming issues
+ exec-used,
+ pointless-statement,
+ unnecessary-lambda,
+ abstract-method,
+ arguments-differ,
+ attribute-defined-outside-init,
+ bad-builtin,
+ bad-indentation,
+ broad-except,
+ deprecated-lambda,
+ expression-not-assigned,
+ fixme,
+ global-statement,
+ global-variable-not-assigned,
+ no-init,
+ non-parent-init-called,
+ protected-access,
+ redefined-builtin,
+ redefined-outer-name,
+ reimported,
+ signature-differs,
+ star-args,
+ super-init-not-called,
+ unnecessary-pass,
+ unpacking-non-sequence,
+ unused-argument,
+ unused-import,
+ undefined-loop-variable,
+ bad-staticmethod-argument,
+ deprecated-method,
+ useless-else-on-loop,
+ lost-exception,
+ pointless-string-statement,
+ useless-super-delegation,
+ deprecated-method,
+ dangerous-default-value,
+ wildcard-import,
+ bad-staticmethod-argument,
+ eval-used,
+ blacklisted-name,
+ pointless-statement,
+ try-except-raise,
+# "C" Coding convention violations
+ bad-continuation,
+ invalid-name,
+ missing-docstring,
+ old-style-class,
+ superfluous-parens,
+ wrong-import-position,
+ wrong-import-order,
+ ungrouped-imports,
+ unused-variable,
+ len-as-condition,
+ cell-var-from-loop,
+ unneeded-not,
+ singleton-comparison,
+ misplaced-comparison-constant,
+ unidiomatic-typecheck,
+ consider-using-enumerate,
+ bad-whitespace,
+ consider-iterating-dictionary,
+ line-too-long,
+ useless-super-delegation,
+ pointless-string-statement,
+ unsupported-membership-test,
+ bad-classmethod-argument,
+ bad-mcs-classmethod-argument,
+# "R" Refactor recommendations
+ abstract-class-little-used,
+ abstract-class-not-used,
+ duplicate-code,
+ interface-not-implemented,
+ no-self-use,
+ too-few-public-methods,
+ too-many-ancestors,
+ too-many-arguments,
+ too-many-branches,
+ too-many-instance-attributes,
+ too-many-lines,
+ too-many-locals,
+ too-many-public-methods,
+ too-many-return-statements,
+ too-many-statements,
+ too-many-nested-blocks,
+ no-else-return,
+ inconsistent-return-statements,
+ simplifiable-if-statement,
+ too-many-boolean-expressions,
+ cyclic-import,
+ redefined-argument-from-local,
+ consider-using-ternary,
+ literal-comparison,
+ consider-merging-isinstance,
+ consider-merging-isinstance,
+ too-many-boolean-expressions,
+ useless-object-inheritance,
+ trailing-comma-tuple,
+ useless-object-inheritance,
+ consider-using-set-comprehension,
+ consider-using-in,
+ useless-return,
+ chained-comparison
+
+[REPORTS]
+# Tells whether to display a full report or only the messages.
+reports=no
+
+[BASIC]
+# Variable names can be 1 to 31 characters long, with lowercase and underscores
+variable-rgx=[a-z_][a-z0-9_]{0,30}$
+
+# Argument names can be 2 to 31 characters long, with lowercase and underscores
+argument-rgx=[a-z_][a-z0-9_]{1,30}$
+
+# Method names should be at least 3 characters long
+# and be lowercased with underscores
+method-rgx=([a-z_][a-z0-9_]{2,}|setUp|tearDown)$
+
+# Module names matching neutron-* are ok (files in bin/)
+module-rgx=(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+)|(neutron-[a-z0-9_-]+))$
+
+# Don't require docstrings on tests.
+no-docstring-rgx=((__.*__)|([tT]est.*)|setUp|tearDown)$
+
+
+[FORMAT]
+# Maximum number of characters on a single line.
+max-line-length=79
+
+
+[VARIABLES]
+# List of additional names supposed to be defined in builtins. Remember that
+# you should avoid to define new builtins when possible.
+additional-builtins=_
+
+[TYPECHECK]
+# List of module names for which member attributes should not be checked
+ignored-modules=six.moves,_MovedItems
+