mds: trigger tableserver active/recovery hook even for self

The tableserver now sends a READY message to clients when they go active;
we need to do this even for our own local tableclients, or else they do
not initialize and hang on first use after bringing up a fresh cluster.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Greg Farnum <greg@inktank.com>