[GROOVY-4292] Update Groovy to 1.8.9 to avoid random livelock during startup...

[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.ClassNode.getInterfaces(ClassNode.java:356)
	at org.codehaus.groovy.ast.ClassNode.declaresInterface(ClassNode.java:946)
	at org.codehaus.groovy.ast.ClassNode.implementsInterface(ClassNode.java:926)
	at org.codehaus.groovy.ast.ClassNode.isDerivedFromGroovyObject(ClassNode.java:916)
	at org.codehaus.groovy.classgen.AsmClassGenerator.isGroovyObject(AsmClassGenerator.java:1070)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitPropertyExpression(AsmClassGenerator.java:1027)
	at org.codehaus.groovy.ast.expr.PropertyExpression.visit(PropertyExpression.java:55)
	at org.codehaus.groovy.classgen.asm.BinaryExpressionHelper.evaluateEqual(BinaryExpressionHelper.java:287)
	at org.codehaus.groovy.classgen.asm.BinaryExpressionHelper.eval(BinaryExpressionHelper.java:76)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitBinaryExpression(AsmClassGenerator.java:519)
	at org.codehaus.groovy.ast.expr.BinaryExpression.visit(BinaryExpression.java:49)
	at org.codehaus.groovy.classgen.asm.StatementWriter.writeExpressionStatement(StatementWriter.java:599)
	at org.codehaus.groovy.classgen.asm.OptimizingStatementWriter.writeExpressionStatement(OptimizingStatementWriter.java:354)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitExpressionStatement(AsmClassGenerator.java:501)
	at org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:40)
	at org.codehaus.groovy.classgen.asm.StatementWriter.writeBlockStatement(StatementWriter.java:80)
	at org.codehaus.groovy.classgen.asm.OptimizingStatementWriter.writeBlockStatement(OptimizingStatementWriter.java:155)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitBlockStatement(AsmClassGenerator.java:447)
	at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:69)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:101)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:112)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitStdMethod(AsmClassGenerator.java:312)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitConstructorOrMethod(AsmClassGenerator.java:269)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitMethod(ClassCodeVisitorSupport.java:123)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethod(AsmClassGenerator.java:389)
	at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1056)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:50)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitClass(AsmClassGenerator.java:173)
	at org.codehaus.groovy.control.CompilationUnit$14.call(CompilationUnit.java:767)
	at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:967)
	at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:546)
	at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:524)
	at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:501)
	at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:306)
	at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:287)
	at groovy.lang.GroovyShell.parseClass(GroovyShell.java:731)
	at groovy.lang.GroovyShell.parse(GroovyShell.java:743)
	at groovy.lang.GroovyShell.evaluate(GroovyShell.java:578)
	at hudson.init.impl.GroovyInitScript.execute(GroovyInitScript.java:83)
	at hudson.init.impl.GroovyInitScript.execute(GroovyInitScript.java:78)
	at hudson.init.impl.GroovyInitScript.init(GroovyInitScript.java:57)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at hudson.init.InitializerFinder.invoke(InitializerFinder.java:120)
	at hudson.init.InitializerFinder$TaskImpl.run(InitializerFinder.java:184)
	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
	at jenkins.model.Jenkins$7.runTask(Jenkins.java:889)
	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)
	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)