Command for searching VMs

[tdviet]

A universal command for searching VMs could be useful. Examples:

• Get VM's ID, site and VO from VM's public IP. So users can manipulate with the VM hosting their services if they remember only hostnames/public IPs of the services. See Enable using hostnames as VM IDs #124
• Get site and VO from local VM's ID (auto-generated by OpenStack and included in cloud-init). See Autodiscovery #136

Syntax for searching VMs should be similar to fedcloud select image or fedcloud select flavor. Could use the module directly, e.g. as fedcloud select vm --public-ip 1.2.3.4.