Add an example audit/repair script

vm_count.py gets number of vms running in a cluster,
react will throw an error if it's above a limit.

Not adding vm_count.json to git, similar to audit.json,
contains api and compute hostnames in addition.

Don't use extrapolation for every log message
Add audit conf files to gitignore

Remove stevedore stuff, not using now, can add back later if needed

Use libvirt bindings to talk to hypervisor. Only one hypervisor
for now, changes soon for multiple hypervisors.

Change-Id: I843e3600a62cb6698526b3498358e4b90121ba1a