Search for pid in more lines for deletion of gradle daemon logfiles

[mawHBT]

For deletion of gradle-daemon logfiles, you sometimes have to search for pid in more lines.

[DaGeRe]

Thanks for the PR. While the overall intention is fine, could you

• [x] check, whether files end on .out.log (we should never accidentally delete files, better safe than sorry)
• [x] write the output to a log4j logger, instead to System.out?

[mawHBT]

static GradleDaemonFileDeleter.getDaemonFilename creates two BufferedReader, one for File, one for String. There's probably a better solution.

[DaGeRe]

Alright, this is ok for now, I'll merge.