Remote / non-root deployments; more toggles

Remote / non-root deployments; more toggles

* Support deploying to remote machines.
* Adds a new deploy_user variable to specify which (sudo-enabled)
  user ansible should use as the default deployment user.  All other
  commands require a become:true to explicitly use root or other user.
* Create separate jabber_domain and web_domain variables
* Option to force git checkouts, overwriting local changes

Signed-off-by: Bill Erickson <berickxx@gmail.com>