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Description of problem:

When disabling IPv4 from DHCPv4 without DNS/Gateway/Route option, 
nmstate will hang at NM_ACTIVE_CONNECTION_STATE_ACTIVATING or
fail with error:

NM main-loop aborted: Connection activation failed on eth2: reason=<enum NM_ACTIVE_CONNECTION_STATE_REASON_DEVICE_DISCONNECTED of type NM.ActiveConnectionStateReason>

Version-Release number of selected component (if applicable):
NetworkManager-1.22.0-0.2.el8.x86_64
nmstate-0.2.0-2.el8

How reproducible:
100%

Steps to Reproduce:
1. sudo nmstatectl set bug_eth1_dhcp4_without_other.yml
2. sudo nmstatectl set bug_eth1_disable_ip.yml
3.

Actual results:

nmstate failed.

Expected results:
No failure.

Additional info:

This is caused by on-going DHCP client. Not sure it's a NM bug or nmstate bug yet.

Created attachment 1644305 [details]
bug_eth1_dhcp4_without_other.yml

Created attachment 1644306 [details]
bug_eth1_disable_ip.yml

Workaround:

Apply this state before switching away DHCP

```yml
---
interfaces:
  - name: eth1
    type: ethernet
    state: absent
```

@mshi, could you please check this one out?

Created attachment 1670758 [details]
verified.log

nmstate-0.2.6-4.8.el8.noarch
NetworkManager-1.22.8-4.el8.x86_64
DISTRO=RHEL-8.2.0-20200316.n.0
Linux kvm-01-guest08.lab.eng.rdu2.redhat.com 4.18.0-187.el8.x86_64 #1 SMP Sat Mar 7 03:42:33 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Verified, check the attachment "verified.log" for the details

Fixed shipped in RHEL 8.2.