Poolmgr -- add retries to specialize call
Poolmgr -- add retries to specialize call

If the pool is new or very busy, we may call the chosen container's
specialize endpoint before it's actually up -- handle the case by
retrying a few times.

Also namespace-qualify service hostname (since router and
functions run in different namespaces).

life1347/fission,life1347/fission,life1347/fission,life1347/fission,platform9/fission,fission/fission,fission/fission,ktrance/fission,ktrance/fission,life1347/fission,life1347/fission,ktrance/fission,life1347/fission,fission/fission,ktrance/fission,life1347/fission,platform9/fission,life1347/fission,ktrance/fission,fission/fission,ktrance/fission,platform9/fission,platform9/fission