Add hardlink generators for LICENSE and README.md to testpath

Git does not handle links, by creating hardlinks, the files will be included in any sdist operations.
.gitignore: Add the LICENSE, README.md hardlinks
gkeys/checks.py: Correctly set the exiry to 5 years (glep 63)
gkeys/config.py: Fix the config defaults to do % substitution for the defaults

If it did not find and loada valid config file, the defaults did not have the % subtitution applied.
The logger calls were not using the logger setting in the config. So I changed that