[devops] Tool to create snapshot for whole environment

In cases we cannot reproduce some issues we need to have ability to store whole devops environment including:

- Block device images for virtual drives (/var/lib/libvirt/images/*)
- Network configuration(virsh net-dumpxml)
- Snapshot of virtual machines memory

and put it all into tarball to send someone or somewhere.

Maybe will be a good idea to implement it as devops subcommand.

Possible helpful ideas:

- Use pigz to gzip tarball
- To deploy this snapshot possible good idea is to change bridge names into dumped network xmls to do not conflict with existing