Another fix for the future node_monitors package extraction.

This time, a simple import removal.

This modification is one of the preliminary steps to the full plugin
extraction later (see JIRA above).
Basically reverts a8c3a031.

That file was wrongly stored as ISO-8859-1, resulting in screwed accents
in the Jenkins UI.

Extended exception handling and logging in CLICommand

https://ci.jenkins-ci.org/job/jenkins_main_trunk/4400/testReport/junit/hudson.util.io/TarArchiverTest/permission/

[FIXES JENKINS-31932]

This change adds code to check that the user isn't attempting to rename
an existing node with the name of another existing node.  Previous to
this change, such rename operations would succeed and would corrupt node
configuration data.

Docker images and other automation use cases often want to make Jenkins
use specific port. Today they do this via init.groovy.d with a
problematic sleep timeout, so allow them to control this value via
system property.

[FIXED JENKINS-31954] Stack overflow reconfiguring some settings where Descriptor.newInstance is gratuitously overridden.

[FIXED JENKINS-24696] Cannot assume that Jenkins.getInstance() != null when we are running a boot failure script.

Otherwise get a meaningless error:
java.lang.InterruptedException
    at java.lang.Object.wait(Native Method)
    at java.lang.Object.wait(Object.java:502)
    at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:267)
    at jenkins.InitReactorRunner.run(InitReactorRunner.java:44)
    at jenkins.model.Jenkins.executeReactor(Jenkins.java:915)
    at jenkins.model.Jenkins.<init>(Jenkins.java:814)
    at hudson.model.Hudson.<init>(Hudson.java:83)
    at hudson.model.Hudson.<init>(Hudson.java:79)
    at hudson.WebAppMain$3.run(WebAppMain.java:225)

Routine errors listening for UDP broadcast or DNS multicast should not print stack traces to the log.

online-node covered by test-cases