Remove openstack.common.test

This module is not used.

Change-Id: I62787aa68474db6e049c92dc1b65ba87f2453474
Merge "Remove openstack.common.test"
metadef modules should only use - from wsme.rest import json

Several metadef module routines use:
from wsme.rest.json import fromjson
from wsme.rest.json import tojson

To follow the import rules at http://docs.openstack.org/developer/hacking/
(only import modules), these should be replaced with:
from wsme.rest import json

Change-Id: Idc496c8753d93a3d39f0c9cbbb31205948eeb081
Closes-bug: 1392485
Merge "metadef modules should only use - from wsme.rest import json"