accomodate latest rpkg git master
    
    Avoid the following traceback.
    
        Could not execute clone: __init__() got an unexpected keyword argument 'distgit_namespaced'
        Traceback (most recent call last):
          File "/usr/lib/python-exec/python3.4/centpkg", line 19, in <module>
            main()
          File "/home/pavlix/src/centpkg/src/centpkg/__main__.py", line 70, in main
            sys.exit(client.args.command())
          File "/usr/lib64/python3.4/site-packages/pyrpkg/cli.py", line 1029, in clone
            self.cmd.clone(self.args.module[0],
          File "/usr/lib64/python3.4/site-packages/pyrpkg/cli.py", line 87, in cmd
            self.load_cmd()
          File "/usr/lib64/python3.4/site-packages/pyrpkg/cli.py", line 117, in load_cmd
            distgit_namespaced=dg_namespaced
        TypeError: __init__() got an unexpected keyword argument 'distgit_namespaced'
    
    Signed-off-by: Pavel Šimerda <pavlix@pavlix.net>