[FIXED JENKINS-20610] symlink FileAlreadyExistsException

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.
[maven-release-plugin] prepare release jenkins-1.540
[maven-release-plugin] prepare for next development iteration
updated changelog for release
[JENKINS-13978] option to copy a view
Merge branch 'fork_fix-fae-exception' of github.com:marco-miller/jenkins into marco-miller-fork_fix-fae-exception
[JENKINS-20610] Noting merge of #1019.
updated changelog for release
updated changelog as a part of the release
merged back the RC branch