Fixed hash DoS problem.

This prevents the load spike at midnight and other known time/date.

Tom Huybrechts reported an incompatibility problem with some plugins (batch task?), so removing the final keyword

The closures sent from the CLI client should carry over its
authentication. Test is written in the SSH cli auth module.

Add some indirection to allow the promoted-builds plugin's
RedeployBatchTaskPublisher to override getMavenBuild() and return the
promotion target's MavenModuleSetBuild object.

Also requires a fix in promoted-builds.

Signed-off-by: Michael Smith <msmith@cbnco.com>

Reworked getBuildStatusSummary() to be based on ResultTrend and thereby fixed some inconsistencies in the 'isWorse' handling

[JENKINS-12199] Fixed bug where job configuration shows a displayname even though the job doesn't have a display name

[JENKINS-11762] Fix displayname issues when renaming or cloning a job. We now clear the display name when cloning or renaming a job.

- I feel uncomfortable with a string field used as an enum.
- I feel uncomfortable with parameters that have some restrictions about
  the way they can be combined.

My change is bit more verbose but it uses less Jelly and I think it's
more in line with the architecture.

- 3 options : run as Local System, Administrator or custom account
- Memory options
- Disconnect the slaves stops correctly and deletes the service
- Reconnecting the slave updates the jenkins-slave.xml configuration

- Loop only on tags between block-start and block-end
- Clearer and shorter code

1) Installer checks Java is installed before proceeding.
   It also tells how to get Java installed.

2) Installer opens http://localhost:8080 when installation is finished.

[FIXED JENKINS-12119] rolling back a portion of 46998ba0446834de0c725c32b328ace7ce844f6a as this is binary incompatible change