Set hostname via ConfConsole "advanced" option

[JedMeister]

I think it would be sweet if you could set the hostname of the server via inithooks/confconsole. It could then either be preseeded or set at from the advanced menu of confconsole (defaults to current predefined hostname).

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[JedMeister]

Will probably be one of the "advanced" inithooks (#369)

[JedMeister]

Would be best to have a non-interactive inithook and an option to interactively set within confconsole "advanced" options.

[JedMeister]

Added @DocCyblade for testing for v14.2

[DocCyblade]

@qrntz - Let me know how you would like me to test this. I could create a mock build from say core or lamp and inject the test version in, and test it that way, or just install it on a existing install and try to break it! I also want to build my own "plug-in" to test that functionality as well. I have not really looked too much into the code yet, how does it keep track that a run once function has been run, so I can reset it and have it run again.