upgrade: ignoring storageDomainIsMemberOfPool exception
upgrade: ignoring storageDomainIsMemberOfPool exception

With VDSM 4.17.13, stopMonitoringDomain raises a
storageDomainIsMemberOfPool exception (code=900) if the
storage domain is already member of a storage pool.
Ignoring it and trying to continue stopping the SPM
as well.

Change-Id: I833c40add0d8a405260f0a148601d21f873b685b
Bug-Url: https://bugzilla.redhat.com/1292178
Signed-off-by: Simone Tiraboschi <cb03129c66ba4da7ba7044049d0f43907bf857bb@redhat.com>

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