The get_port_binding_by_status_and_host function was rehomed into
neutron-lib with https://review.openstack.org/#/c/580786/ and released
in neutron-lib 1.18.0. This patch consumes the function by removing it
in neutron and replacing all uses with lib's version.
NeutronLibImpact
Change-Id: Iac3246d0eb59709749e0b7e857091447d11a0133