core: InitVdsOnUp - proceed regardless of problematic iso/export domain

Prior to this patch, when host reported iso/export domain as problematic
during the InitVdsOnUp flow it didn't move to status UP.

As currently when ISO/Export domains are reported as problematic by some
of the hosts those hosts remain UP and doesn't move to NonOperational,
the behaviour between those two flows should be unified - therefore it
was decided that when hosts reports iso/export domain as in problem
it won't stop it from moving to UP.

Change-Id: I32372aa80d7193a814f2500231d4545d2b1a5fc3
Bug-Url: https://bugzilla.redhat.com/967604
Signed-off-by: Liron Aravot <laravot@redhat.com>
Signed-off-by: Tal Nisan <tnisan@redhat.com>