Added annotations to kernel security classes.

Most of methods define @Nonnull inputs and outputs (the legacy behavior is mostly non-documented), but there're several exceptions
Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[FIX JENKINS-16827] Don't try to guess the build number

[READY] Additional null checks for node access methods.

Fixed node handling methods in order to comply with https://github.com/jenkinsci/jenkins/commit/3f8fc4e2ec5b1b421e1551a2a2fc2a284be330d1Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

Cf.: https://github.com/jenkinsci/remote-terminal-access-plugin/commit/db24e2126b649689652ac8ddb100f3ef6680a422

Annotate hudson.Util methods by @CheckForNull and @Nonnull

Add logging to PeepholePermalink's RunListener

Annotated hudson.model.Build and hudson.model.Run, minor fixes in Javadoc

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[FIXED JENKINS-20559 and JENKINS-19454] - hudson.Launcher bugfix and additional wrapper

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

Conflicts:
	core/src/main/java/hudson/model/Job.java

Added missing null checks for Computer::getNode(), SlaveComputer::getNode() and AbstractBuild::getCurrentNode()
Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

Conflicts:
	core/src/main/java/hudson/model/AbstractBuild.java

The change adds some missing null checks
Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

Conflicts:
	core/src/main/java/hudson/model/CauseAction.java
	core/src/main/java/hudson/triggers/SCMTrigger.java

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>

[FIXED JENKINS-22699] - JUnit Archiver. Add option to archive only when successful

[READY][FIXED JENKINS-15094] - Handle null parameter values to avoid massive executor deaths

Javadoc: Noting changes in Executor availability check approaches (1.536)

Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>