Imports to fix build warnings

There were warnings generated during the build due to missing
attributes, like this:

 keystoneclient.rst:7: WARNING: missing attribute mentioned in
   :members: or __all__: module keystoneclient.__init__, attribute
   v2_0

This is fixed by importing the symbol in __init__.

Closes-Bug: #1315523

Change-Id: I565c78ef8910353c4e1ce1641b42fba7cdbd77d8

keystoneclient/__init__.py

@@ -15,6 +15,15 @@
 
 import pbr.version
 
+from keystoneclient import access
+from keystoneclient import client
+from keystoneclient import exceptions
+from keystoneclient import generic
+from keystoneclient import httpclient
+from keystoneclient import service_catalog
+from keystoneclient import v2_0
+from keystoneclient import v3
+
 
 __version__ = pbr.version.VersionInfo('python-keystoneclient').version_string()
 

keystoneclient/apiclient/__init__.py

@@ -15,6 +15,8 @@
 
 import warnings
 
+from keystoneclient import exceptions
+
 # NOTE(akurilin): Module 'keystoneclient.apiclient' contains only exceptions
 # which are deprecated, so this module must also be deprecated which helps
 # to report 'deprecated' status of exceptions for next kind of imports