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Description of problem:
When converting unmanaged interface to managed, the ip, routes etc should be preserved(like in nmstate python).
This is an extended test and regression of the verification in https://bugzilla.redhat.com/show_bug.cgi?id=1935710#c9 , the consequence is the failure of configuring DNS.

Version-Release number of selected component (if applicable):
nmstate-2.1.1-0.alpha.20220602.5accbd1.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
ip link add veth0 type veth peer name veth0_ep
ip link set veth0 up
ip link set veth0_ep up

ip addr add 192.168.199.1/24 dev veth0
ip addr add 192::1/64 dev veth0
ip route add default via 192.168.199.254 dev veth0 metric 2000
ip -6 route add default via 192::254 dev veth0 metric 2000

nmstatectl show # there are IPs and configured/running routes in veth0

echo "
interfaces:
  - name: veth0
    type: ethernet
    state: up
" | nmstatectl apply

nmstatectl show # ip and the routes are removed

Actual results:
ip and the routes are removed

Expected results:
Preserve ip and routes

Additional info:

Patch posted to upstream: https://github.com/nmstate/nmstate/pull/1960

Verified with:
nmstate-2.1.3-1.el9.x86_64
NetworkManager-1.39.10-1.el9.x86_64

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 (nmstate bug fix and enhancement update), 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-2022:7991