Another fix for the future node_monitors package extraction.

This time, a simple import removal.

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

The jline code appears to not use junit at all and this erronous dep
causes us to pull in junit and hamcrest without any good reason.

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.