relay-group update

[mpeck]

the relay group command is mostly how we want it. We just need to put member actions, adding and removing bundles and relays, under their own sub-subcommand. The usage info needs to be tweaked a bit as well.

[mpeck]

USAGE
    relay-group <SUBCOMMAND>
    relay-group info [FLAGS] [group_name ...]
    relay-group create [FLAGS] <group_name>
    relay-group rename [FLAGS] <old_relay_name> <new_relay_name>
    relay-group delete [FLAGS] <group_name>
    relay-group member <SUBCOMMAND>
    relay-group member add [FLAGS] <group_name> <relay_name ...>
    relay-group member remove [FLAGS] <group_name> <relay_name ...>
    relay-group member assign [FLAGS] <group_name> <bundle_name ...>
    relay-group member unassign [FLAGS] <group_name> <bundle_name ...>