openstack: explains args vs argv

Signed-off-by: Loic Dachary <loic@dachary.org>

teuthology/openstack/__init__.py

@@ -259,6 +259,12 @@ def get_ip(self, instance_id, network):
 class TeuthologyOpenStack(OpenStack):
 
     def __init__(self, args, config, argv):
+        """
+        args is of type argparse.Namespace as returned
+        when parsing argv and config is the job 
+        configuration. The argv argument can be re-used
+        to build the arguments list of teuthology-suite.
+        """
         super(TeuthologyOpenStack, self).__init__()
         self.argv = argv
         self.args = args