Werk #7489: mk_logwatch: optimize regex search

For regular expressions in a logwatch section leading or trailing '.' portions can be a performance desaster. With long log lines, it can virtually render your system paralyzed. If you are not using any rewrite patterns though, you can omit leading and trailing '.' expressions without changing the set of matched lines.

mk_logwatch now detects those cases, and will optimize the patterns accordingly.

To the list of all Werks