[JENKINS-26118] Add details and optimize logging
Merge pull request #13 from KostyaSha/JENKINS-26118

[JENKINS-26118] Add details and optimize logging
Ensure BufferedReader in parseLog is closed

[FIXED JENKINS-25800] Ensure BufferedReader in parseLog is closed

Added a try/finally block around the reader, so it doesn't leak resources. BufferedReader will automatically call close on the FileReader it wraps.