Set parameters for OpenDaylight ML2 driver

Now that https://review.openstack.org/#/c/85589/ is merged, the
OpenDaylight ML2 driver requires that url, username and password
parameters are set.

Change-Id: Iecbdd3275387bea145a5d274d359a15eceaee6b7
Closes-Bug: #1304226
Merge "Set parameters for OpenDaylight ML2 driver"