The amount of time remaining before the cache corresponding
to this MDT join TLV is deleted from the device and the
corresponding MDT multicast routing entry is marked as a
non-MDT entry.
Note that multiple TLVs for a data MDT group may be received
by a device. Upon receipt, the expiry timer of an already
existing entry is restarted and so ciscoMvpnMdtJnRcvExpTime
is updated.