Jail config

Jails are not always the same, i.e. starting a lx jail the same way that we start a non-lx jail is problematic. Setting resolvers through different OS's is also not simple.

This is related to both #45 (closed) and #46.

TODO:

• install (after clone)
• init (before jail)
• boot (part of exec and inner jail)
• halt (before shutdown)
• login (for console)