Update to latest oslo-version.

Remove the need for versioninfo file and just use python's PKG-INFO.

Change-Id: I4765141e9bf3fa075dfbbc6a07e495c29e12177b

glanceclient/openstack/common/importutils.py

@@ -29,7 +29,7 @@ def import_class(import_str):
     try:
         __import__(mod_str)
         return getattr(sys.modules[mod_str], class_str)
-    except (ValueError, AttributeError), exc:
+    except (ValueError, AttributeError):
         raise ImportError('Class %s cannot be found (%s)' %
                           (class_str,
                            traceback.format_exception(*sys.exc_info())))
@@ -57,3 +57,11 @@ def import_module(import_str):
     """Import a module."""
     __import__(import_str)
     return sys.modules[import_str]
+
+
+def try_import(import_str, default=None):
+    """Try to import a module and if it fails return default."""
+    try:
+        return import_module(import_str)
+    except ImportError:
+        return default