Remove deprecated host to interface mapping config

[Carol Bouchard]

Originally the host to interface mapping assumed any config without a reserved word was a host/interface mapping. Even if someone made a typo with a reserved word, it was interpreted as host/interface mapping.
This method of configuration was deprecated by host_ports_mapping config dictionary.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/568963

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/568963
Committed: https://git.openstack.org/cgit/openstack/networking-cisco/commit/?id=d9ed547c83181169f8336acb7bd22cb2dbdad925
Submitter: Zuul
Branch: master

commit d9ed547c83181169f8336acb7bd22cb2dbdad925
Author: Carol Bouchard <email address hidden>
Date: Wed May 16 17:18:20 2018 -0400

    Remove deprecated host/interface map config

    Originally the host to interface mapping assumed any config without a
    reserved word was a host/interface mapping. Even if someone mistyped
    a reserved word, it was interpreted as host/interface mapping. This
    changeset removes this method of configuration which is now deprecated
    by the host_ports_mapping config dictionary.

    Change-Id: I0d1f4efd7701d313f33046339b1ceea148308739
    Closes-bug: #1771672