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Add basic support for quering a public IP address. All uses of this IP
address are returned which are currently rendered to a dummy template.

Include an additional action to helpdesk view. Based on the current
status of the virtual machine helpdesk user is allowed to start it or
shut it down.

This comes handy since in most cases vm suspension needs to be
followed up with some kind of network cut off of the corresponding
machine. Since no such option is currently available from the
software, machine shutdown is provided as an alternative.

Refs #3452

Refs #3453

VM lookup is triggered when search query matches the following patterns

- vm<id>
- vm-<id>

- Do not use autocomplete feature (usernames are now stored in astakos
  db)
- Translate provided username to retrieve user uuid
- UI: Display network operstate in as badge. Hide deleted vms in nics
  lists.

as an alternative method to helpdesk details view. If network interface
exists with the passed ip, the details of the owner of the machine linked to
the network interface will be displayed.

- Display vm os
- DIsplay network connected vms
- Short view of user info
- Other minor styling improvements

- New json view to return a list of existing users with a prefix ending
  with "@" to be used for autocompletion in helpdesk account name input.
- Proper non existing account handling. If no vms or private networks exist
  for the specified account notify helpdesk user that the account
  doesn't seem to exist instead of displaying empty lists of vms/nets.