fix wrong urls; minor cosmetic fixes
distinct config and category; add -s to signature now that is not taken

* gkeys was tricked when we passed both --config and --category because these
arguments had the same -c shortcut
* Now that seeds argument became --category added -s to signature.
python3 fixes
gkeys/actions.py: Set the default category to 'rel' if not set
gkeys/lib/py: Fix a missing space in a debug message
gkeys/lib.py: Add --no-permision-warning gpg option
gkeys: stub cleanseed, cleankey options
gkeys/ations.py: Move ssl-fetch import to action function it is used

This reduces the import load to only be for the function it is used.
It also removes the import on a system that does not have all the dependencies installed.