Add ovs-ofctl to the neutron sudoers file

Not sure how this was missed, but this is necessary to make the
neuton-openvswitch-agent work properly.

!version-patch
Add other network tools to neutron sudoers

and alphabetize because why not?
Merge pull request #520 from craigtracey/neutron-sudoers

Add ovs-ofctl to the neutron sudoers file