Register LBaaS resources to quotas engine

Adding register_quotas=True argument to
resource_helper.build_resource_info() function
in order to register LBaaS resources to quotas engine

This change is actually a continuation of https://review.openstack.org/#/c/69803
change which was already approved

Change-Id: Ib75027ce4a1bea3d453f57b107d29546ec6743e5
Closes-Bug: #1305957
Merge "Register LBaaS resources to quotas engine"