Adding correct  Requires in neutron-plugin-contrail package; so that during upgrade the dependent packages will also be upgraded.
supervisord_<service>.conf files needs to be replaced if it is present in the system.
Added missing nova-cert.ini in the supervisord_openstack_config_files
Fix openstack-nova-api name and adding openstack-nova-cert in the post installation steps.
remove noreplace from contrail-openstack-havana-config.spec as well.

Change-Id: I616872e55036d654a4f5bf49d3bffb57319f5ec4