Cross-platform changes to onos.initd

We now can use start-stop-daemon (debian), daemon()
shell function (centos), or sudo (others) to start
onos-service.

It should be backward compatible on systemd systems.

Tested on Ubuntu 14 and CentOS 6. Should also work on
Ubuntu 15/16, CentOS 7, Debian, and Fedora.

(Note that we should test this against various OSes,
preferably automatically rather than manually!)

Addresses at least part of ONOS-2907

Change-Id: I4ded98baf02321a5a9db37fdff19e1ce4a3d23d2
diff --git a/tools/test/bin/onos-uninstall b/tools/test/bin/onos-uninstall
index ff8ff53..cf767c4 100755
--- a/tools/test/bin/onos-uninstall
+++ b/tools/test/bin/onos-uninstall
@@ -26,9 +26,8 @@
 
 remote=$ONOS_USER@${1:-$OCI}
 
-ssh $remote "
-    sudo stop onos 1>/dev/null 2>/dev/null
-
+ssh -tt $remote "
+    sudo service onos stop  1>/dev/null 2>/dev/null
     # Wait for onos to stop up to 5 seconds
     for i in \$(seq 1 5); do
       [ -z \"\$(ps -ef | grep karaf.jar | grep -v grep)\" ] && break