[FIXED JENKINS-12753] Added PluginStrategy.getShortName to avoid actually trying to unpack a plugin before throwing RestartRequiredException.

See PR #1233 and discussion therein.
(cherry picked from commit b8c3f61c)

=== Starting buildShellScriptOnSlave(org.jenkinsci.plugins.workflow.job.WorkflowTest)
.. hudson.slaves.CommandLauncher launch
INFO: slave agent launched for slave0
Exception in thread "Executor #0 for slave0 : executing org.jenkinsci.plugins.workflow.support.steps.ExecutorStep$PlaceholderTask$PlaceholderExecutable@c455a14" java.lang.IllegalStateException: Trying to remove unknown computer
	at hudson.model.AbstractCIBase.removeComputer(AbstractCIBase.java:149)
	at hudson.model.Computer.removeExecutor(Computer.java:837)
	at hudson.model.Executor.run(Executor.java:263)

[JENKINS-14979] Add actual URL redirected to to log output

Testing the bot

Fixing JENKINS-22750, regression introduced in JENKINS-21394

Use logging API correctly and introduce the ability to differentiate between the logging level for task execution taking too long

Cf.: https://github.com/jenkinsci/subversion-plugin/pull/83

[FIXED JENKINS-22938] SSH slave connections die after the slave outputs 4MB of stderr, usually during findbugs analysis

for LogRotator

Added missing target attributes to links and fixed some apostrophes.
Also incorporated jglick's suggestions on quoting with '{'.

See PR #1233 and discussion therein.

Fix NPE.

Add missing items in the French localization