LP1825891 Use Hatch 'hostname' for workstation reg.

LP1825891 Use Hatch 'hostname' for workstation reg.

Populate the workstation name with the hostname of the PC when
registring a new workstation for Hatch-enabled workstations.

Note the code gracefully returns null if Hatch returns a 404 (not found)
or Hatch is not active.

Updates the AngJS and Angular workstation admin pages to load the
hostname value when possible.

Signed-off-by: Bill Erickson <berickxx@gmail.com>