Cleanup testenv security group

Only permit external services from the internet.
Permit all traffic between members of the security group.
Merge pull request #303 from craigtracey/ipmitoo

Add ipmitool to the standard set of tools
Change mode on sudoers files

sudoers should be 440 and not 400. the OS will correct this for us,
but this results in tasks showing "changed" unecessarily.
Adding an ampersand to the swift services

Some of the services like to be backgrounded, so just add it here.
Merge pull request #300 from blueboxgroup/cleanup-testenv-security-group

Cleanup testenv security group