Save server's zone name in @edit[:new]

[h-kataria]

This was preventing from Save button to be enabled when only Server's zone name was changed on the server settings screen.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1639877

[mzazrivec]

The spec failure seems related:

NameError:
       uninitialized constant VMDB::Config
     # ./spec/controllers/ops_controller/settings/common_spec.rb:446:in `block (5 levels) in <top (required)>'

[miq-bot]

Checked commit h-kataria@d39a97e with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
2 files checked, 0 offenses detected
Everything looks fine. 🏆

[skateman]

@h-kataria can you show this to me on bluejeans? The BZ description is not very helpful, it seems like it works for me even without applying your patch.

[h-kataria]

Closing this PR in favor of backporting #4072 to Gaprindashvili
Verified this issue does not exist on Hammer and current master branches.