Fix typo in ml2 configuration file

Change-Id: I1d191a2c69d7450584e0ee25a0f5fce237b1c817
Closes-Bug: #1305226
(cherry picked from commit a7da625571a5acb161246e62713da81526a8d86b)
Merge "Fix typo in ml2 configuration file" into stable/icehouse