1119648: Added additional functionality to repo listing.

Added the --list-enabled and --list-disabled options for explicitly
specifying only enabled or disabled repos. --list now acts as a
shorthand for specifying both.
@dgoodwin makes a good point about these duplicating

looks like just the only input that changes is the args list, and repos.
And repos input could just be a tuple of ("1","0", "0") etc for enabled status
only output that changes is the results of re.search