tests: Adjust test 767095 to cope with long hostnames

BUG: 1084147
Change-Id: Ie1ff8852a501690e681072c54620d305b5e20d6a
Signed-off-by: Justin Clift <justin@gluster.org>
Reviewed-on: http://review.gluster.org/7395
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>