Orphan File Checker

[selfcommit]

This issue is being presented as an opportunity for the Github community to make any further suggestions about implementation before an attempt is made to implement a solution.

Work will start on or about July 13

Details from the Simian feature request doc are below:

Problem:
No clear indication if changes in the XML of of Munki Package will also clear a previously uploaded file.

Solution:
Create an “orphan file check” That compares expected package files to existing bucket files and removes any orphans.

[selfcommit]

This seems to be resolved in /cron/maintenance/verify_packages

https://github.com/google/simian/blob/master/src/simian/mac/cron/maintenance.py#L102

Should be good to close