gluster: Host detach case sync message corrected

Corrected the event log message displayed in the case of detach of a
host from CLI. Now it shows the hots name as well in the message
corrected instead of showing as UNKNOWN.

Change-Id: I2858ded9cfac2dc6df03928b90469876878aa94d
Bug-Url: https://bugzilla.redhat.com/956996
Signed-off-by: Shubhendu Tripathi <shtripat@redhat.com>