Brocade mechanism driver depends on the brocade plugin templates

This causes problems when the customer installs the ml2
plugin/mechanism driver without the Brocade plugin.

Fixes bug: #1326937

Change-Id: I2d0dfda2cdfbdfd8503351b191151cb02104dcce
(cherry picked from commit 2efc40ba6b63f8ad1c2e1c98b562012fa1154ed5)
Merge "Brocade mechanism driver depends on the brocade plugin templates" into stable/icehouse