Parse Ironic packages files/{apts, rpms}/ironic

When VIRT_DRIVER=ironic, make sure devstack picks up packages listed in its
respective packages file.  These were previously missed unless "ironic" was
explictly added to the enabled services.  This ensures required packages
are installed for any of the ir-* services.

Change-Id: I3d70009819a3a6933220cabd5a951a20c7b48849
diff --git a/functions-common b/functions-common
index c6fd5c7..e6caaa3 100644
--- a/functions-common
+++ b/functions-common
@@ -824,6 +824,10 @@
             if [[ ! $file_to_parse =~ neutron ]]; then
                 file_to_parse="${file_to_parse} neutron"
             fi
+        elif [[ $service == ir-* ]]; then
+            if [[ ! $file_to_parse =~ ironic ]]; then
+                file_to_parse="${file_to_parse} ironic"
+            fi
         fi
     done