[GROOVY-4292] Update Groovy to 1.8.9 to avoid random livelock during startup when init.groovy specified.
"GroovyInitScript.init" daemon prio=10 tid=0x00007f28d0001800 nid=0x48 runnable [0x00007f28cb79e000]
   java.lang.Thread.State: RUNNABLE
	at java.util.WeakHashMap.get(Unknown Source)
	at org.codehaus.groovy.ast.ClassHelper.makeCached(ClassHelper.java:121)
	at org.codehaus.groovy.ast.ClassHelper.makeWithoutCaching(ClassHelper.java:183)
	at org.codehaus.groovy.ast.ClassHelper.make(ClassHelper.java:170)
	at org.codehaus.groovy.ast.ClassHelper.make(ClassHelper.java:159)
	at org.codehaus.groovy.vmplugin.v5.Java5.makeClassNode(Java5.java:382)
	at org.codehaus.groovy.vmplugin.v5.Java5.makeParameter(Java5.java:403)
	at org.codehaus.groovy.vmplugin.v5.Java5.makeParameters(Java5.java:396)
	at org.codehaus.groovy.vmplugin.v5.Java5.configureClassNode(Java5.java:331)
	at org.codehaus.groovy.ast.ClassNode.lazyClassInit(ClassNode.java:262)
	- locked <0x00000000f4bfe2b0> (a java.lang.Object)
	at org.codehaus.groovy.ast...

ComputerLauncherTest failed with LANG=ja_JP. 

Root cause of class loading error (on jnr.ffi.util.ref.internal.Finalizer$ShutDown) still unclear,
but easy fix is to simplify ClientAuthenticationCache.save to use FilePath.chmod,
which at least for now relies on hudson.util.jna.GNUCLibrary rather than JNR.

[FIXED JENKINS-19135] Permit a user to configure an axis with no values without throwing exceptions.
The project cannot be usefully built in this case but at least they can go back and reconfigure it.
Also fixing Layouter.Column to not throw NoSuchElementException (in violation of Iterator contract)
and thus break project overview when there is an empty Axis in the trivial list (due to an unintentional IndexOutOfBoundsException).

[JENKINS-17332] Allow sign up with username that exists because of SCM commit.

Fix potential NPE on exception path

[JENKINS-19082] Fix ListView includeRegex

Merge branch 'jenkins_19156_windows_processkiller' of https://github.com/synopsys-arc-oss/jenkins into pr903

Resolves https://issues.jenkins-ci.org/browse/JENKINS-19156



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

Conflicts:
	changelog.html

correct help text of Label field => can be a Label Expression

https://jenkins.ci.cloudbees.com/job/core/job/jenkins_main_trunk/1065/testReport/junit/hudson.model/ProjectTest/testPoll/

Eliminated the wrong script tag generation from <st:bind/>