Two files are added to the python_binding folder:
* The rdc_collectd.py is a collectd plugin to store the RDC
metrics to the collectd round robin database.
* The rdc_collectd.conf is a configure file which can control
which fields to collect, how frequently the fields can be collected
and run the plugin in embedded mode.
Change-Id: Ief44d004376ca8a82ed0d8ad36805243acb47080
Bill(Shuzhou) Liu