Update initialize.sh script for MLAB deployment

* Sets the UID and GID to drop privileges to in oonib.conf
* Randomly selects either the tcp or http helper service to bind on port 80
* Removes the iptables rules that are no longer needed.
Make it not look like we're shouting in the README.
Merge remote-tracking branch 'aagbsn/master'

 * Closes PR#2