mgcp-client: Mark client as UP when keepalive request-interval/timeout is disabled through VTY

This way if keepalive becomes disabled for an MGW, it can be selected
again (otherwise it would become non-selectable forever, and we already
have a "blocked" config for that).

Fixes: 563386e8bbf0bc6d9050d87f79208d6784e219cf
Related: SYS#6481
Change-Id: I263d23885a1a967f844033f9810b96691b8e3b30
1 file changed