Use ConfigParser instead of SafeConfigParser

in Python 3 The SafeConfigParser class has been renamed
to ConfigParser in Python 3.2 [1]. The alias SafeConfigParser
maybe removed in future versions of Python 3. Use ConfigParser
instead of SafeConfigParser in Python 3.We're switching from
SafeConfigParser to ConfigParser because we're we're not explicitly
using the 'Safe' functionality.So it make the code potentially neater
if SafeConfigParser is even de-aliased in python3.

[1] http://bugs.python.org/issue10627

Change-Id: I932ced300a93040144e89c7f4acc95480b32749d

openstack_requirements/project.py

@@ -19,6 +19,7 @@ import collections
 import errno
 import io
 import os
+
 from six.moves import configparser
 
 from parsley import makeGrammar
@@ -57,7 +58,7 @@ def extras(project):
     """Return a dict of extra-name:content for the extras in setup.cfg."""
     if 'setup.cfg' not in project:
         return {}
-    c = configparser.SafeConfigParser()
+    c = configparser.ConfigParser()
     c.readfp(io.StringIO(project['setup.cfg']))
     if not c.has_section('extras'):
         return {}