core: Replace oVirt logger with slf4j in bll/gluster

Replaces oVirt logger with slf4j in bll/gluster package.

Stacktraces are logged only to debug for exceptions with clear custom
error message.

Change-Id: I6f5419168ce6b26c110839dcd85cac995e5aa5db
Bug-Url: https://bugzilla.redhat.com/1109871
Signed-off-by: Martin Perina <mperina@redhat.com>
core: Replace oVirt logger with slf4j in bll/job

Replaces oVirt logger with slf4j in bll/job package.

Stacktraces are logged only to debug for exceptions with clear custom
error message.

Change-Id: I1546a4b1183442aa0a8784e722442e9ddd09d716
Bug-Url: https://bugzilla.redhat.com/1109871
Signed-off-by: Martin Perina <mperina@redhat.com>
core: Replace oVirt logger with slf4j in bll/XXX

Replaces oVirt logger with slf4j in following bll subpackages:
dwh, eventqueue, job, lock, lsm, memory, pm, provider, quota and
snapshots.

Stacktraces are logged only to debug for exceptions with clear custom
error message.

Change-Id: I564678b8226542a4900450f8a0e5aa0c7249df70
Bug-Url: https://bugzilla.redhat.com/1109871
Signed-off-by: Martin Perina <mperina@redhat.com>