Fix interactive mode with command line args

The cmdloop in cmd2 looks for a --test option in the parsed arguments which doesn't work if you want to pass other arguments in interactive mode.  If any other arguments are passed in, an exception is thrown.

Change-Id: Iacd3d338dce74f4de9eaf5c9c8ad8ac9f9ae32e3
Closes-Bug: #1103218
Merge "Fix interactive mode with command line args"