tests: Fix typo in M2 definition

Thanks to Anoop CS for finding the bug

Change-Id: I237e3a396967096b8e49200aed279af970e0a4d5
BUG: 1141167
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/8707
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Justin Clift <justin@gluster.org>
Reviewed-by: Anand Avati <avati@redhat.com>