Make sure bridge provision is disabled for Nova network

Currently CONFIG_PROVISION_ALL_IN_ONE_OVS_BRIDGE values are undeterministic
and can have (true|y) and (false|n) values. This is temporary fix and we will
need to create more robust fix for boolean parameters in the future.

Change-Id: I18c37e5f277e0117c94867fe8e8ef727db73b77f
Fixes: rhbz#1115444
Merge "Make sure bridge provision is disabled for Nova network"