Removes the Old Flow Tracker NF Launch Script (#74)

The Flow Tracker NF had an old version of the `go.sh` script. This PR deletes it and replaces it with a symlink to a global script. 

Commit Log:

 * Replace old go.sh script with new global symlink

Author: koolzz

examples/flow_tracker/go.sh

@@ -0,0 +1 @@
+../go.sh