Remove commented configuration of the intersphinx module

The intersphinx module should not be used. Remove commented configuration
of the intersphinx module to not enable it in the future.

Change-Id: Ie24b1c2842cf3bc2e82e094de905da7ac9d432a4
Related-Bug: #1368910

doc/source/conf.py

@@ -21,7 +21,6 @@ sys.path.insert(0, os.path.abspath('../..'))
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = [
     'sphinx.ext.autodoc',
-    #'sphinx.ext.intersphinx',
     'oslosphinx'
 ]
 
@@ -69,6 +68,3 @@ latex_documents = [
      u'%s Documentation' % project,
      u'OpenStack Foundation', 'manual'),
 ]
-
-# Example configuration for intersphinx: refer to the Python standard library.
-#intersphinx_mapping = {'http://docs.python.org/': None}