lvm: add logs to indicate finshing reload lvs op

Change-Id: I5631ba9960e0098ee376fd47a0f629d7be9d9319
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=979193
Signed-off-by: Yeela Kaplan <ykaplan@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/19021
Reviewed-by: Dan Kenigsberg <danken@redhat.com>