Better debug messages in JSONSignatureValidator
Merge pull request #1462 from cyrille-leclerc/add-verbose-logs

Better debug messages in JSONSignatureValidator
Update ChoiceParameterDefinition

The "it.value" don't exist, so we need to set the defaultParameterValue. 

It help me display correctly parameter for my multilauncher plugin. 
Note that other ParameterDefinition use the default value to display parameter, so IMO it is safe to do this.
Merge pull request #1463 from intelradoux/patch-1

Update ChoiceParameterDefinition
Explode WAR fails when ./target does not yet exist (e.g., run from IDEA).

Create parent directory before trying to lock dir using files.

java.lang.Exception: Failed to initialize exploded war
at org.jvnet.hudson.test.WarExploder.getExplodedDir(WarExploder.java:49)
at org.jvnet.hudson.test.JenkinsRule.createWebServer(JenkinsRule.java:582)
at org.jvnet.hudson.test.JenkinsRule.newHudson(JenkinsRule.java:538)
at org.jvnet.hudson.test.JenkinsRule.before(JenkinsRule.java:332)
at org.jvnet.hudson.test.JenkinsRule$2.evaluate(JenkinsRule.java:482)
at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: java.io.FileNotFoundException: /Users/integer/Documents/idea/jenkins-ws-git-plugin/./target/jenkins-for-test.exploding (No such file or directory)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.(FileOutputStream.java:212)
at java.io.FileOutputStream.(FileOutputStream.java:104)
at org.jvnet.hudson.test.WarExploder.explode(WarExploder.java:99)
at org.jvnet.hudson.test.WarExploder.(WarExploder.java:58)
... 24 more