Add definition for domain service configuration

This defined type creates the necessary files to be able to start/stop
SUN Application Server domains. Invocation:

  sunappserver::config::service { 'foodomain':
    runas => 'foouser'
  }

This will create /etc/init.d/sunappserver-foodomain and
/etc/sysconfig/sunappserver-foodomain.

For compatibility with existing configurations, when this defined type
is called with title 'domain1' (the default SUN Application Server
domain), it creates the files /etc/init.d/sunappserver and corresponding
config file /etc/sysconfig/sunappserver.