Remove 'nova-console' service, 'console' RPC API

This legacy service was only compatible with the XenServer driver and
has effectively been replaced by the noVNC console proxy service. Remove
the service. The API that provided remote access to this service,
'os-consoles', was removed in a previous change. Note that
'os-remote-consoles' is unrelated and therefore is not removed, though
it will now reject requests for XVP VNC consoles.

This was previously discussed and agreed on openstack-dev [1] and
openstack-discuss [1].

Part of blueprint remove-xvpvncproxy

[1] http://lists.openstack.org/pipermail/openstack-dev/2018-October/135413.html
[2] http://lists.openstack.org/pipermail/openstack-discuss/2019-April/005369.html

Change-Id: Ib1ff32f04b16af7981471f67c8e0bf04e6ecb6be
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

setup.cfg

@@ -66,7 +66,6 @@ console_scripts =
     nova-api-os-compute = nova.cmd.api_os_compute:main
     nova-compute = nova.cmd.compute:main
     nova-conductor = nova.cmd.conductor:main
-    nova-console = nova.cmd.console:main
     nova-dhcpbridge = nova.cmd.dhcpbridge:main
     nova-manage = nova.cmd.manage:main
     nova-network = nova.cmd.network:main