core: remove ovirt logger from vdsbroker and friends

this code is a total spaghetti.

Bug-Url: https://bugzilla.redhat.com/1109871
Change-Id: Iae367e2c2fe3df862c8a345ca73575198f4c6edd
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>