Merge branch 'fork_fix-fae-exception' of github.com:marco-miller/jenkins into marco-miller-fork_fix-fae-exception

Fix javadoc warning in Combination

[FIXED JENKINS-20615] - Fixed variable reference in TestResult/index_ru....

Resolves https://issues.jenkins-ci.org/browse/JENKINS-20615



Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>

Implemented the hook

Removed import that was only used to attempt to satisfy the javadoc
reference to the class.

Replaced the javadoc reference to an inner class with a fully
qualified reference to the same inner class.

in preparation of introducing other hooks

[FIXED JENKINS-7285] Fix regression from 1.536

Integrated the fix in Stapler.

Added NamingThreadFactory to ensure that all code creating thread pool executors was marking the threads.
Otherwise we get a bunch of pool-17-thread-5 with no clue who created so many threads or why.
Also simplifies existing code which previously had to write one-off ThreadFactory implementations just to set a name.

[JENKINS-19622] Merged #989: allow background tasks to run simultaneously, preventing task blockage.

Merge branch 'scheduled-executor-timer' of github.com:recampbell/jenkins into recampbell-scheduled-executor-timer

Retrying 3 times while waiting for 100 millis between retries (at
recreating symlink after "deleting" it). Ends up throwing FAE exception
if thrown for a 4th time in a row - as not much can be done at that
point. A warning is logged in that case, prior to throwing the last FAE.