This change removes the forced use of config drive to ensure that a user
can choose to use config drive as needed. This adds ability to
disable/enable config drive and allows libvirt to listen for connections
on tcp as needed for live migrations (prohibited otherwise by config drive).
The following new variables were added to os_nova role:
nova_force_config_drive
nova_libvirtd_listen_tls: 1
nova_libvirtd_listen_tcp: 0
nova_libvirtd_auth_tcp: sasl
Change-Id: I1de35a4b3611b8bc33a21930dae3fd38f9aaa151
Closes-Bug: #1468514
DocImpact
e65066cf12