On slave, add labels and ability to control java version. On master node, add ability to disable the configuration of the firewall.

[dcrissman]

There are really three things I am addressing in this pull request.

Slave

1. Add labels
2. Add ability to control version of java installed

Master

1. All for firewall to be disabled in case of conflicting modules

[buildhive]

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[dcrissman]

@rtyler This is my re-submittal of #14. In this pull request I attempt to address not only my own issues, but also #5 and #13.

[jenkinsadmin]

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[matthewbarr]

1. I'm in favor of the labels.
2. I'd really prefer to be using an external java module, such as puppetlabs/java, but that's opened as a new issue. I don't think adding this in will hurt anything as it stands. It can be changed in the future.
3. Sounds like a good idea to allow people to disable. Moving to a configurable port is good. Making it automatically get the port from the config might be better. I can't see why this is a bad first step, though.