Use uwsgi for nova when NOVA_USE_MOD_WSGI is not False

Unless NOVA_USE_MOD_WSGI is False, run nova-api and nova-metadata
using uwsgi.

Because the metadata server is always expected to run on a port and
without a prefix, we have it configured to use uwsgi but not to
proxy from apache: uwsgi listens on the configured port itself.

uwsgi process that listen themselve do not need a socket or to
chmod-socket, so those config lines have been moved to the block
that is also writing proxy configuration for apache.

Because this change only uses uwsgi for nova-api and nova-api-meta,
nova-api-meta is set to default to enabled in stackrc because the
nova-api wsgi application used by wsgi only presents the one service
(osapi_compute).

If NOVA_USE_MOD_WSGI is False and tls_proxy service is enabled,
nova-api is run on an internal port reached via the tls_proxy.

Depends-On: I8ff08d61520ccf04e32dcd02f4cecc39dae823cb
Change-Id: If2d7e363a6541854f2e30c03171bef7a41aff745
diff --git a/stackrc b/stackrc
index 50f7c89..eccc52a 100644
--- a/stackrc
+++ b/stackrc
@@ -53,7 +53,7 @@
     # Keystone - nothing works without keystone
     ENABLED_SERVICES=key
     # Nova - services to support libvirt based openstack clouds
-    ENABLED_SERVICES+=,n-api,n-cpu,n-cond,n-sch,n-novnc,n-cauth
+    ENABLED_SERVICES+=,n-api,n-cpu,n-cond,n-sch,n-novnc,n-cauth,n-api-meta
     # Placement service needed for Nova
     ENABLED_SERVICES+=,placement-api,placement-client
     # Glance services needed for Nova