[JENKINS-24244] If we are skipping polling due to quietingDown, at least record this fact in the system log.

Trying to make testRemoteKill less prone to random failure (presumably on a heavily loaded machine).

Missed this in previous commit - bad idea making even small changes late at night ;)

(cherry picked from commit 3daa6a97)

(cherry picked from commit 286337ea)

Adapted from #1375 by @daniel-beck: omitting change to User construction, and adding test.
(cherry picked from commit 088edabb)

Conflicts:
	changelog.html

Adapted from #1375 by @daniel-beck: omitting change to User construction, and adding test.

Missed this in previous commit - bad idea making even small changes late at night ;)

[FIXED JENKINS-24358] RunSaveableReference.get can acquire locks, so avoid calling it while holding a lock on ourselves.

Added no-store to the Cache-Contorl header

Reference: http://stackoverflow.com/questions/866822/why-both-no-cache-and-no-store-should-be-used-in-http-response
Reference: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.2

Integrating dom4j with the fix for java.lang.ClassCastException:
org.dom4j.DocumentFactory cannot be cast to org.dom4j.DocumentFactory

See: https://github.com/stapler/stapler/pull/36

This change improves the handling of errors in hudson.model.Executor, which cause issues like JENKINS-18164.
The change also introduces several annotations in order to prevent further issues.
Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

The option allows to manage the refresh period of the internal queue cache.
Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

Signed-off-by: NAnders Hammar <anders@hammar.net>

… hudson.ExpressionFactory2$JexlExpression evaluate
WARNING: Caught exception evaluating: it.authorities in /user/demo/. Reason: java.lang.reflect.InvocationTargetException
java.lang.reflect.InvocationTargetException
	at …
Caused by: org.acegisecurity.userdetails.UsernameNotFoundException: demo
	at hudson.security.SecurityRealm$None$2.loadUserByUsername(SecurityRealm.java:494)
	at jenkins.security.ImpersonatingUserDetailsService.loadUserByUsername(ImpersonatingUserDetailsService.java:32)
	at hudson.model.User.impersonate(User.java:282)
	at hudson.model.User.getAuthorities(User.java:769)
	... 93 more

Pulling doChildrenContextMenu up from AbstractProject into Job, since the latter already defines permalinks.