Function arguments define short CLI options

Allow function arguments to define a short version of the name as well
as the long version.  The exclude hosts short flag has been changed to a
capitol so it will be less likely to conflict with subcommands.

Change-Id: Ie5f45aad83d2830e520ac8311b76f96f8e339962
Added tenant and instance UUID flags

The env dict will now also contain tenant and instance UUID values so
subcommands will not require them explicitly.

Change-Id: If381d42aeb090cc415689ada33161d901296a043
Merge "Function arguments define short CLI options"
Merge "Added tenant and instance UUID flags"