Exclude constants from autodoc

Since the 2.1.0 release of Sphinx, the docs fail to build because of the
warnings-treated-as-errors of the now autodoc'd imported external
modules[1]. This change configures sphinx-autodoc to ignore those
constants so that the docs can build and the documentation from the
external modules isn't included in keystone's.

[1] https://github.com/sphinx-doc/sphinx/issues/6447

Change-Id: I7b1c2c740727446d5460dc0025e47e0e9b388d10

doc/source/conf.py

@@ -53,6 +53,16 @@ apidoc_excluded_paths = [
     'test']
 apidoc_separate_modules = True
 
+autodoc_default_options = {
+    'exclude-members': 'Column,Index,String,Integer,Enum,ForeignKey,DateTime,'
+                       'Date,TIMESTAMP,IntegrityError,OperationalError,'
+                       'NotFound,Boolean,Text,UniqueConstraint,'
+                       'PrimaryKeyConstraint,joinedload,Unicode,'
+                       'RequestValidator,Client,AccessTokenEndpoint,'
+                       'ResourceEndpoint,AuthorizationEndpoint,SIG_HMAC,'
+                       'RequestTokenEndpoint,oRequest'
+}
+
 # sphinxcontrib.seqdiag options
 seqdiag_antialias = True
 seqdiag_html_image_format = 'SVG'