Merge branch 'master' into JENKINS-34755

Conflicts:
	core/src/main/java/hudson/Util.java
	core/src/main/java/hudson/WebAppMain.java
	core/src/main/java/hudson/model/Item.java
	core/src/main/java/hudson/model/Queue.java
	core/src/main/java/hudson/model/UpdateCenter.java
	core/src/main/java/hudson/security/csrf/DefaultCrumbIssuer.java
	core/src/main/java/hudson/slaves/NodeProvisioner.java
	core/src/main/java/jenkins/model/Jenkins.java
	core/src/main/java/jenkins/slaves/NioChannelSelector.java
	core/src/main/java/jenkins/util/xml/XMLUtils.java