Re-enable set by command-line option and environment file.  We need this
at Stanford so we can get private DNS names to use with VPC's.

The only interesting change is moving the option parsing up a bit.

Make easy to use host names.

This change also puts both a jumpbox rule and a private ip address rule
for the jumpbox so that ansible can provision it.

Feanil/splunk role

E0d/analytics server