Fix policy.json file format
Fix policy.json file format

There is an extra comma in policy.json, so if we try to read this
file, using json.loads(), we'll get an error.
Removed a trailing comma from json structure in policy.json file.

Change-Id: I94944e99f8cad03e4e6cc8a3532c63afd9bcc6b7

rdo-management/tuskar,rdo-management/tuskar,rdo-management/tuskar