Removed command line params that were dangerous to give end users

--os : Manually set the target OS for the service ; default (auto detected)
--ver : Manually set the target OS version; default (auto detected)
--pidfile : The path where the .pid file will be created; default (/var/run/sync-gateway.pid)
--srccfgdir : The path to the source sync_gateway JSON config directory)
--srccfgname : The name of the source sync_gateway JSON config file)