The value of tmnxMobGwSysGroupOperState indicates the current
redundancy state of this group. The redundancy state may be one of:
'none' - no redundancy is configured in this group.
'hot' - standby card is ready to become active in case of a active
card failure.
'warm' - No card is ready to become active in case of a active card
failure. Backup card is up, but not in sync with the active
card.
'cold' - No card is ready to become active in case of a active card
failure. No protect card is configured in this group or the
backup card is operationally down.