Replace %r with %s on printing string variable

Change-Id: Idd8c15255f024bba7079d3a9a29545dec0c91b58

Author: Hongbin Lu

openstackclient/common/clientmanager.py

@@ -132,13 +132,13 @@ def get_plugin_modules(group):
     """Find plugin entry points"""
     mod_list = []
     for ep in pkg_resources.iter_entry_points(group):
-        LOG.debug('Found plugin %r', ep.name)
+        LOG.debug('Found plugin %s', ep.name)
 
         try:
             __import__(ep.module_name)
         except Exception:
             sys.stderr.write(
-                "WARNING: Failed to import plugin %r.\n" % ep.name)
+                "WARNING: Failed to import plugin %s.\n" % ep.name)
             continue
 
         module = sys.modules[ep.module_name]