Force httpclient to use a new protocol socket factory which does not explicitly bind to the client side interface.

Update jenkins.init.in

[FIXED JENKINS-20245]

Integrated v2.38

Improved documentation.

[FIXED JENKINS-21394] Avoid irrelevant job queing while node is offline

Conflicts:
	test/src/test/java/hudson/model/ProjectTest.java

Ugly hack to fix destroyProcess for Java8

[FIXED JENKINS-22553] Do not expose plugin list that can be a subject of modification

(It may have a @TestExtension QueueItemAuthenticatorDescriptor if one is needed.)

No sense in spending ~20s running HtmlUnit to verify code which has since been deleted anyway (configuration-time ACL checks).

Test of JENKINS-13502 fix is obsolete since we no longer check permissions when configuring triggers.