Add lock owner thread info to slow request.
Remove unnecessary call to get thread dump when we have the id of the thread we want.
Remove commented out lines.
Removed unused method.
Add null check for locked threads.
Removed unnecessary goto statement since inner loop is now gone.
Merge pull request #6 from christ66/ZD-20184

Add lock owner thread information to slow requests.
Trying to avoid triggering JENKINS-24358 deadlock.
Useful to note the query string, relevant for example for REST API requests.
[maven-release-plugin] prepare release support-core-2.13
[maven-release-plugin] prepare for next development iteration