Optimize VIRL job scheduling algorithm based on available VIRL
host capacity. Add IP pool availability pre-checks.
- add quota based on max. allowe IPs and max. allowe VMs per virl
- use one common bootstrap file instead of two separate files (one
for ubutnut, another for centos)
Change-Id: Ic40122a084624ff9c5eafa9f372b0451e857e29a
Signed-off-by: Peter Mikus <pmikus@cisco.com>