Use doc8 style checker

This uses the doc8 style checker to check that document
files conform to certain requirements, as documented at
    https://pypi.python.org/pypi/doc8.

Some files were modified because they had lines that
were longer than 79 characters.

Change-Id: I94e081e197898359676821cfcf8cb1133ed28bc5

doc/source/api_v1.rst

@@ -7,8 +7,10 @@ ironicclient Python API
 The ironicclient python API lets you access ironic, the OpenStack
 Bare Metal Provisioning Service.
 
-For example, to manipulate nodes, you interact with an `ironicclient.v1.node`_ object.
-You obtain access to nodes via attributes of the `ironicclient.v1.client.Client`_ object.
+For example, to manipulate nodes, you interact with an
+`ironicclient.v1.node`_ object.
+You obtain access to nodes via attributes of the
+`ironicclient.v1.client.Client`_ object.
 
 Usage
 =====

doc/source/cli.rst

@@ -37,7 +37,8 @@ environment variables::
 The command-line tool will attempt to reauthenticate using the provided
 credentials for every request. You can override this behavior by manually
 supplying an auth token using :option:`--ironic-url` and
-:option:`--os-auth-token`, or by setting the corresponding environment variables::
+:option:`--os-auth-token`, or by setting the corresponding environment
+variables::
 
     export IRONIC_URL=http://ironic.example.org:6385/
     export OS_AUTH_TOKEN=3bcc3d3a03f44e3d8377f9247b0ad155

test-requirements.txt

@@ -4,6 +4,7 @@
 hacking<0.11,>=0.10.0
 coverage>=3.6
 discover
+doc8 # Apache-2.0
 fixtures>=1.3.1
 httpretty<0.8.7,>=0.8.4
 mock>=1.2

tox.ini

@@ -25,6 +25,7 @@ downloadcache = ~/cache/pip
 [testenv:pep8]
 commands =
     flake8 {posargs}
+    doc8 doc/source CONTRIBUTING.rst README.rst
 
 [testenv:cover]
 setenv = VIRTUAL_ENV={envdir}