Use kind when descriptor.id != descriptor.clazz.name and $clazz otherwise.

to lookup descriptor by id or by Describable class name

to match some specific use cases.

to prevent inefficient channel overuse

[JENKINS-26698] Make sure BuildExecution.cleanUp always calls super, to release the workspace lease.
Also stop closing the build log in Run.handleFatalBuildProblem; we want to see any subsequent messages too.

Observed in 1.580.1 on credentials-plugin (which you would think would be tiny and fast to get):
"Update center installer thread [#1]" #70 daemon prio=5 os_prio=0 tid=0x00007f5634815800 nid=0x64a8 runnable [0x00007f567cfe4000]
   java.lang.Thread.State: RUNNABLE
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.read(SocketInputStream.java:150)
	at java.net.SocketInputStream.read(SocketInputStream.java:121)
	at java.io.BufferedInputStream.read1(BufferedInputStream.java:284)
	at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
	- locked <0x00000007aa3ec760> (a java.io.BufferedInputStream)
	at sun.net.www.MeteredStream.read(MeteredStream.java:134)
	- locked <0x00000007aa3eedd8> (a sun.net.www.MeteredStream)
	at java.io.FilterInputStream.read(FilterInputStream.java:133)
	at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3322)
	at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3315)
	at org.apache.commons.io.input.ProxyInputStream.read(ProxyInputStream.java:77)
	at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:766)
	at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1138)
	at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1298)
	at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1116)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:104)
	at java.lang.Thread.run(Thread.java:745)

If a project action fails to load we should log the project action and continue to load the project.

[JENKINS-22811] Folder loading can break when an item inside the folder fails to load or throws an Exception.

[FIXED JENKINS-10944] [FIXED JENKINS-24519] If makeBuildable fails on a FlyweightTask, keep it in queue.

Plenty of plugins assume that a FlyweightTask will behave in a certain way
and might break if this feature were simply disabled.

#1406 silently skipped the call to moveDirectory in case newBuildDir.isDirectory(), rather than throwing an IOE as renameTo does.
Also deleting apparently useless call to forceMkdir.

when some other process is waiting for build in queue.

[JENKINS-25691] Might have prevented the need for: https://github.com/jenkinsci/maven-plugin/pull/33

Allow Projects to take the Queue.Item's actions into consideration when determining their default authentication

- Also tidy up some holes in locking strategy that can cause builds to be scheduled on
  executors that are about to be interrupted or nodes in the process of being removed

jenkins.model.Jenkins::getInstance() method is marked as @CheckForNull, but the most of Jenkins code does not actually check the return value. It leads to tons of static analysis errors, hence it is hard to analyze the code.

The change also adds annotations to old methods like Hudson::getInstance()
Signed-off-by: NOleg Nenashev <o.v.nenashev@gmail.com>