monitoring: Storage domain status must be verified by the broker.
monitoring: Storage domain status must be verified by the broker.

Broker is responsible for all storage operations, so broker must,
using specific submonitor, validate storage periodically
and report storage status to the agent. Agent should only
retrieve validation results from the broker.

Storage in LocalMaintenance mode is always reported as valid.

Change-Id: Ida9592be71e12228b61a574e5da76fd50d184c7b
Bug-Url: https://bugzilla.redhat.com/1353608
Signed-off-by: Denis Chaplygin <c9765bc4e17067a9b371ba0697b416c9f2022720@redhat.com>

oVirt/ovirt-hosted-engine-ha,oVirt/ovirt-hosted-engine-ha,oVirt/ovirt-hosted-engine-ha,oVirt/ovirt-hosted-engine-ha