core: fix backup log messages
core: fix backup log messages

Changing the message logged in case of backup from
"Started"/"Finished" to "Backup Started"/"Backup Finished"

Change-Id: I44bf5219c035a8e6b40fba2f8888bad5a48e9904
Bug-Url: https://bugzilla.redhat.com/1396586
Signed-off-by: emesika <dc8a2a200abf66067593de2e51fee9376f06ea0f@redhat.com>
Signed-off-by: Martin Perina <7bf83f5b771f1cc16b652b5fe02fa33310bda7b0@redhat.com>

walteryang47/ovirt-engine,eayun/ovirt-engine,eayun/ovirt-engine,walteryang47/ovirt-engine,yapengsong/ovirt-engine,walteryang47/ovirt-engine,yapengsong/ovirt-engine,zerodengxinchao/ovirt-engine,yapengsong/ovirt-engine,eayun/ovirt-engine,zerodengxinchao/ovirt-engine,zerodengxinchao/ovirt-engine,yapengsong/ovirt-engine,zerodengxinchao/ovirt-engine,walteryang47/ovirt-engine,eayun/ovirt-engine,yapengsong/ovirt-engine,eayun/ovirt-engine,walteryang47/ovirt-engine,zerodengxinchao/ovirt-engine