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Description of problem:

When applying empty state, the nmstate will move the DNS config to the default gateway interface instead of preserving old DNS config savings.

Version-Release number of selected component (if applicable):
nmstate-0.0.7-1.el8

How reproducible:
100%


Steps to Reproduce:
1. Use nmcli to save a DNS entry in a non-default gateway interface.
2. Create `empty.yml` with below content:

---
interfaces: []

3. sudo nmstatectl set empty.yml

Actual results:

The DNS config moved to the interface with default gateway.

Expected results:

The old DNS config been preserved.

Additional info:
Upstream fix is a87f03dc7b8377340da9c20b82344bbf9d1933c0

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:3347