Disable JcloudsLocation opening iptables rules

- Allow it to be enabled via config OPEN_IPTABLES, but by default it's
  disabled.
- It was breaking things (due to `sudo -n` on centos, which needs fixed
  separately), when using jclouds to ssh to machine as part of creating
  the VM.
- It's needed for (some) RHEL VMs
TomcatServer live test: code tidy
Merge pull request #797 from aledsage/fix/JcloudsLocation-iptables-disabling

Fix: JcloudsLocation iptables disabling