fix: fail2ban-regex with filter file failed (after merging #824, because test case missing);
test case for 'readexplicit' added;
coverage: no cover (for failed except)
testExecuteTimeout fixed: give a test still 1 second, because system could be too busy
ConfigReader.touch renamed into protected _create_unshared
Merge pull request #830 from sebres/_tent/cache-config-read-fix1

fix: fail2ban-regex with filter file failed