Remove project_id from nova service urls

Nova API itself supports both URL modes:
  with project-id and without project-id
However, we are changing service catalogs for removing project-id
based on the discussion.
We have agreement on https://review.openstack.org/#/c/181393 like the
following:

 - Standard required naming for endpoints (versioned vs. unversioned,
   contains project ID vs. no project ID).
    * We want unversioned endpoints so that the user can get
      information about multiple available versions in a given cloud.
    * We do not want project ID, account ID, or tenant ID as part of
      the resource URI for an OpenStack API endpoint.

So this patch removes project-id from Nova service catalog for this
direction.

Change-Id: Ifd74152727b5c0c75924419a7a52e024a69ce72c
diff --git a/lib/nova b/lib/nova
index 1b3d086..9449cfa 100644
--- a/lib/nova
+++ b/lib/nova
@@ -429,9 +429,9 @@
         get_or_create_endpoint \
             "compute" \
             "$REGION_NAME" \
-            "$nova_api_url/v2.1/\$(project_id)s" \
-            "$nova_api_url/v2.1/\$(project_id)s" \
-            "$nova_api_url/v2.1/\$(project_id)s"
+            "$nova_api_url/v2.1" \
+            "$nova_api_url/v2.1" \
+            "$nova_api_url/v2.1"
     fi
 
     if is_service_enabled n-api; then