Network state reuse

[pevogam]

We have to think about ways to extend the reusability of a test setup beyond single atomic states and test objects:

1. Reusing networks of vms for a test (network and bridge setup) can also be used to possibly speed up the strongswan test group and similar tests where network setup still cannot be reused but could speed them up dramatically.

2. Checking host tests setup is not possible since it is based on states of objects and not the host.

Snapshot of host could solve both problems but there could also be better ways.

[pevogam]

We should do some experimentation with LXC snapshots and implement at least a simple LXC state setup backend.

For more info see the lxc-snapshot command.