This commit introduces a command which can be invoked by kolla
playbook to bootstrap XenAPI - xenapi_bootstrap. This command
will invoke some modules's functions to do needed boostrap
tasks. At the moment it includes:
* configure himn
* configure iptalbes to allow traffic
* install xapi plugins to dom0
* gather XenAPI facts and save them into a file
The facts file will used others e.g. kolla deployment can
get facts from it and populate relative configures basing
on the facts.
Change-Id: Ie2d7d40f2755580aac4a10f3d302190a8bd4fe6f
f88521682e