Revert "Exclude constants from autodoc"

This reverts commit 485a6b2170.

With the release of Sphinx 2.1.1[1] constants are no longer autodoc'd so
we don't have this problem any more.

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

Change-Id: I8231f95e13ffad8f57ea6d7ae28216bfa27dc3d3

doc/source/conf.py

@@ -53,16 +53,6 @@ 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'