remove generic extras.d support

This removes the generic extras.d support, which we said we'd do at
Mitaka-1. In tree extras.d continues to function as before, though we
need stories to get ceph and ironic into plugins, and a better
solution for Tempest.

Change-Id: I8b134446dc08a2c3852423ca71af2f469f85496e
diff --git a/functions-common b/functions-common
index d68ae77..91a1486 100644
--- a/functions-common
+++ b/functions-common
@@ -1741,17 +1741,18 @@
     if [[ -d $TOP_DIR/extras.d ]]; then
         local extra_plugin_file_name
         for extra_plugin_file_name in $TOP_DIR/extras.d/*.sh; do
-            [[ -r $extra_plugin_file_name ]] && source $extra_plugin_file_name $mode $phase
-            # NOTE(sdague): generate a big warning about using
-            # extras.d in an unsupported way which will let us track
-            # unsupported usage in the gate.
+            # NOTE(sdague): only process extras.d for the 3 explicitly
+            # white listed elements in tree. We want these to move out
+            # over time as well, but they are in tree, so we need to
+            # manage that.
             local exceptions="50-ironic.sh 60-ceph.sh 80-tempest.sh"
             local extra
             extra=$(basename $extra_plugin_file_name)
             if [[ ! ( $exceptions =~ "$extra" ) ]]; then
-                deprecated "extras.d support is being removed in Mitaka-1"
-                deprecated "jobs for project $extra will break after that point"
-                deprecated "please move project to a supported devstack plugin model"
+                warn "use of extras.d is no longer supported"
+                warn "processing of project $extra is skipped"
+            else
+                [[ -r $extra_plugin_file_name ]] && source $extra_plugin_file_name $mode $phase
             fi
         done
     fi