Fixes #3481 - Don't have to set a hostname for each interface, but it must be unique if it is set.
(cherry picked from commit 18897b8cbc9e83bbd70cb515c1704ce149d574f3)
Conflicts: app/models/nic/managed.rb
Fixes #3481 - Don't have to set a hostname for each interface, but it must be unique if it is set.
(cherry picked from commit 18897b8cbc9e83bbd70cb515c1704ce149d574f3)
Conflicts:
app/models/nic/managed.rb