Keep pre-commit inline with hacking and fix whitespace

The flake8 hook for pre-commit installs its own flake8 which is
not what hacking is pinned to. This results in a bunch of errors.
By doing a local hook we can cause these to be the same.

There are flake8 exclusions in tox.ini that need to be used
in pre-commit. Also we should exclude svg files from the whitespace
modifications, because who cares.

Once those are fixed, running pre-commit -a fixes some whitespace
issues. While the normal use isn't to run -a - if someone does make
a patch that touches any of these they'll get erroneous unrelated
errors compared to their lower work - so fix all of the existing
issues, which are mostly space-at-end-of-line issues it seems.

Change-Id: I78e753492e99c03b30a0a691db3bd75ee3d289c9

.pre-commit-config.yaml

@@ -6,16 +6,27 @@ repos:
       - id: trailing-whitespace
       - id: mixed-line-ending
         args: ['--fix', 'lf']
+        exclude: '.*\.(svg)$'
       - id: check-byte-order-marker
       - id: check-executables-have-shebangs
       - id: check-merge-conflict
       - id: debug-statements
-      - id: flake8
-        additional_dependencies:
-          - hacking>=1.1.0,<1.2.0
+        # nova/cmd/manage.py imports pdb on purpose.
+        exclude: 'nova/cmd/manage.py'
       - id: check-yaml
         files: .*\.(yaml|yml)$
   - repo: https://github.com/Lucas-C/pre-commit-hooks
     rev: v1.1.7
     hooks:
       - id: remove-tabs
+        exclude: '.*\.(svg)$'
+  - repo: local
+    hooks:
+      - id: flake8
+        name: flake8
+        additional_dependencies:
+          - hacking>=1.1.0,<1.2.0
+        language: python
+        entry: flake8
+        files: '^.*\.py$'
+        exclude: '^(doc|releasenotes|tools)/.*$'

doc/source/reference/threading.rst

@@ -28,9 +28,9 @@ in the long-running code path. The sleep call will trigger a context switch
 if there are pending threads, and using an argument of 0 will avoid introducing
 delays in the case that there is only a single green thread::
 
-	from eventlet import greenthread
-	...
-	greenthread.sleep(0)
+    from eventlet import greenthread
+    ...
+    greenthread.sleep(0)
 
 In current code, time.sleep(0) does the same thing as greenthread.sleep(0) if
 time module is patched through eventlet.monkey_patch(). To be explicit, we recommend

tools/nova-manage.bash_completion

@@ -13,25 +13,25 @@ _get_nova_manage_subopts () {
 
 _nova_manage()
 {
-	local cur prev subopts
-	COMPREPLY=()
-	cur="${COMP_WORDS[COMP_CWORD]}"
-	prev="${COMP_WORDS[COMP_CWORD-1]}"
+    local cur prev subopts
+    COMPREPLY=()
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    prev="${COMP_WORDS[COMP_CWORD-1]}"
 
-	if [ "x$_nova_manage_opts" == "x" ] ; then
-		_nova_manage_opts="`nova-manage bash-completion 2>/dev/null`"
-		_nova_manage_opts_exp="`echo $_nova_manage_opts | sed -e "s/\s/|/g"`"
-	fi
+    if [ "x$_nova_manage_opts" == "x" ] ; then
+        _nova_manage_opts="`nova-manage bash-completion 2>/dev/null`"
+        _nova_manage_opts_exp="`echo $_nova_manage_opts | sed -e "s/\s/|/g"`"
+    fi
 
-	if [[ " `echo $_nova_manage_opts` " =~ " $prev " ]] ; then
-		if [ "x$(_get_nova_manage_subopts "$prev")" == "x" ] ; then
-			subopts="`nova-manage bash-completion $prev 2>/dev/null`"
-			_set_nova_manage_subopts "$prev" "$subopts"
-		fi
-		COMPREPLY=($(compgen -W "$(_get_nova_manage_subopts "$prev")" -- ${cur}))
-	elif [[ ! " ${COMP_WORDS[@]} " =~ " "($_nova_manage_opts_exp)" " ]] ; then
-		COMPREPLY=($(compgen -W "${_nova_manage_opts}" -- ${cur}))
-	fi
-	return 0
+    if [[ " `echo $_nova_manage_opts` " =~ " $prev " ]] ; then
+        if [ "x$(_get_nova_manage_subopts "$prev")" == "x" ] ; then
+            subopts="`nova-manage bash-completion $prev 2>/dev/null`"
+            _set_nova_manage_subopts "$prev" "$subopts"
+        fi
+        COMPREPLY=($(compgen -W "$(_get_nova_manage_subopts "$prev")" -- ${cur}))
+    elif [[ ! " ${COMP_WORDS[@]} " =~ " "($_nova_manage_opts_exp)" " ]] ; then
+        COMPREPLY=($(compgen -W "${_nova_manage_opts}" -- ${cur}))
+    fi
+    return 0
 }
 complete -F _nova_manage nova-manage