provide localization for HudsonHomeDiskUsageMonitor.getDisplayName()

Just import changes, from hudson.model.Jenkins -> jenkins.model.Jenkins,
and Javadoc comments.
Signed-off-by: NNigel Magnay <nigel.magnay@gmail.com>

Signed-off-by: NNigel Magnay <nigel.magnay@gmail.com>

Honor $JENKINS_HOME (just like we used to do $HUDSON_HOME)
We still fall back to $HUDSON_HOME every step of the way
for maximum backward compatibility.

I wasn't initially planning to do this for the first version,
but working on native packages made me think we should deliver this.

Hudson APIs: tasks.Shell, model.Hudson, model.*LoadStatistics,
             slaves.ConnecationActivityMonitor, PluginManager
XStream APIs: util.CopyOnWriteList, util.Robust*Converter, model.Result,
              model.BuildAuthorizationToken, model.Fingerprint
Stapler APIs: diagnosis.HudsonHomeDiskUsageMonitor, os.solaris.ZFSInstaller
args4j APIs: model.Job, cli.GroovyCommand, cli.handlers.*


git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@23277 71c3de6d-444a-0410-be80-ed276b4c234a

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@20667 71c3de6d-444a-0410-be80-ed276b4c234a

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@20666 71c3de6d-444a-0410-be80-ed276b4c234a

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@16365 71c3de6d-444a-0410-be80-ed276b4c234a