* [JENKINS-31448] Protect against NPE in update center on restart

* rename updateSite private methods

[JENKINS-53763] warp successive words in help

Add missing space

Properties parse:
foo=blah\
   this

As: foo=blahthis
-- stripping leading whitespace...

Fixes:
* /legend
* /cli/

* JENKINS-36547: Introduce Queue.Task.getAffinityKey()

and use it in LoadBalancer.assignGreedily() to find a node for a task.

* JENKINS-36547: Fix Javadoc error

* fixup! JENKINS-36547: Fix Javadoc error

* Fixed Javadoc for Queue.getAffinityKey()

[JENKINS-52024] - Update Metainf services from 1.4 to 1.8 in the master branch

Migrate into localization-zh-cn-plugin

[JENKINS-53847] Improve JavaDoc for Util.fixNull (Hacktoberfest)

Trivial follow-ups to JEP-304

See https://github.com/jenkinsci/localization-zh-cn-plugin

introduce hudson.Util#fixNull(value, defaultValue)

[JENKINS-46725] - Update jnr-posix to 3.0.45 to prevent Illegal Reflective access warnings

[JENKINS-51903] - Allow specifying multiple Java versions in Jenkinsfile

[JENKINS-52024] - Hard dependency on lib-annotation-indexer to override stale version provided by transitive deps

Backports Jenkinsfile from the java11-support branch

Upgrade to latest version of Remoting.

Primarily this eliminates a potential deadlock in managing the ProtocolStack.

Remove SECURITY-218 class import from TcpSlaveAgentListener test.

Signed-off-by: NNicolas De Loof <nicolas.deloof@gmail.com>

YAGNI.

[JENKINS-53593] Fix class loader error specific to OS.

* JENKINS-53353 Do not cache results of View.getActions()

Plugins that may affect the view, eg via TransientViewActionFactory
that get installed _after_ a `view` has been initally viewed
will not be able to add anything to the view if the results
of getActions() are cached.

* JENKINS-53353 Removed unnecessary synchronization

* JENKINS-53353 Whitespace

* JENKINS-53353 Restored (and deprecated) updateTransientActions

to maintain backwards compatibility.

[JENKINS-46523] - Make UnixReflection class compatible with Java 11, remove pre-Java 8 reflection (#3650)

* [JENKINS-46523] - Make UnixReflection class compatble with Java 9+, remover pre-Java-8 code

Ideally this logic should be replaced by Multi-Release JAR

* [JENKINS-46523] - FindBugs annotations complicate the code here

* [JENKINS-53799 ] - Explicitly reference the JIRA ticket in the error message

[JENKINS-53721] - Add getter/setter to EnvVars so the envinject plugin can set Platform safely (#3639)

[JENKINS-53721] - Add getter/setter to EnvVars so the envinject plugin can set Platform safely

[JENKINS-53693] - Ignore java.xml components in Mocked core tests

JDK-11 support: refactor code to avoid underscore variable names

[JENKINS-53793] - Suppress DMI_COLLECTION_OF_URLS in ClassicPluginStrategy

It is require to make the tests passing on Java 11, but apparently it also speeds up tests on Java 8.