Compute / Virtual DC should only work when unattended is enabled

Adds VNC support within the browser

At first, this allows to view oVirt managed hosts within foreman.

fixes minor ovirt validation bug

Add Connection testing for EC2 compute

fixes #1540 added suport for provisioning on ovirt/rhvem using fog.

This patch addes a compute resource concept within foreman

Signed-off-by: Ohad Levy <ohadlevy@gmail.com>

fixes #1538 - allow to search hosts based on their puppet master

fixing subnet import that was broken after rails3 upgrade

minor code syntax cleanup

code smell

Fixes #944 - clear network conflicts

When a network conflict is detected (such as conflicting ip/name dns or
dhcp records), foreman would try to suggest a resolution.

Signed-off-by: Paul Kelly <paul.ian.kelly@googlemail.com>