1. don't install drushrc 2. don't install apache config (hostmaster-install does that) 3. install directly in /var/aegir again, as aegir assumes that
Signed-off-by: 
Yannick Brosseau <yannick.brosseau@gmail.com>
we use webmaster@example.com if we're installing on localhost and webmaster@$aegir_host otherwise
it's usually the same as the URL, and indeed we default to that now
this shouldn't affect default behavior, which should still create only one backend server. but it will allow people to specify a --aegir_db_host parameter to change the db server.
don't bother checking for drush_make version at this stage, not relaible and causes problems for really old versions