Neutron LBaaS data model allows the users to pick a specific
provider to implement a given load balancer instance (described
by Pool in LBaaS v1.0 API). This commit brings this option into
the heat resources as a property and an attribute.
Co-Authored-By: Magesh GV <magesh.gv@oneconvergence.com>
Change-Id: Id55b8e615516c2ffd9d06980fb60707b207c356e