make cache scripts stand-alone
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This merge request is automatically copied from !144 (merged) orginally made by @dcameron
The following commits were omitted due to cherrypick failures or deliberately skipped since they are merge commits from master or next-major:
fce5c5a5 227c836f e55fe1ab
Inspect the merge request and only merge if you are sure everything that should be included is included.
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Fixes #16 (closed)
The cache scripts cache-clean and cache-list are now independent of the infosystem perl modules. They implement their own configuration parsing and logging.