/etc/resolv.conf with dnsname plugin and user namespace not using dnsname resolver

[ykuksenko]

/kind bug

Description

When running a container that is using a user namespace attached to a non default network with dnsname plugin enabled /etc/resolv.conf contains the hosts resolvers instead of the dnsmasq resolver for the network.

Steps to reproduce the issue:

[root@f31 ~]# cat /etc/resolv.conf
# Generated by NetworkManager
search example.org
nameserver 192.168.0.200
[root@f31 ~]# useradd woot
[root@f31 ~]# podman network create woot
/etc/cni/net.d/woot.conflist
[root@f31 ~]# podman run --rm -ti -p 2000:2000 --network=woot library/alpine cat /etc/resolv.conf
search example.org
nameserver 10.89.0.1
[root@f31 ~]# podman run --rm -ti -p 2000:2000 --subuidname=woot --subgidname=woot --network=woot library/alpine cat /etc/resolv.conf
search example.org
nameserver 192.168.0.200

Describe the results you received:
The output for /etc/resolv.conf for the two runs was different, first producing the dnsmasq resolver and the second time producing the hosts resolver.

Describe the results you expected:
I expected /etc/resolv.conf to contain 10.89.0.1 in both cases.

Additional information you deem important (e.g. issue happens only occasionally):
This is on a fedora 31 server system.
Output of podman version:

Version:            1.8.0
RemoteAPI Version:  1
Go Version:         go1.13.6
OS/Arch:            linux/amd64

Output of podman info --debug:

debug:
  compiler: gc
  git commit: ""
  go version: go1.13.6
  podman version: 1.8.0
host:
  BuildahVersion: 1.13.1
  CgroupVersion: v2
  Conmon:
    package: conmon-2.0.10-2.fc31.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.0.10, commit: 6b526d9888abb86b9e7de7dfdeec0da98ad32ee0'
  Distribution:
    distribution: fedora
    version: "31"
  MemFree: 4174106624
  MemTotal: 6228332544
  OCIRuntime:
    name: crun
    package: crun-0.12.1-1.fc31.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 0.12.1
      commit: df5f2b2369b3d9f36d175e1183b26e5cee55dd0a
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJL
  SwapFree: 6371143680
  SwapTotal: 6371143680
  arch: amd64
  cpus: 4
  eventlogger: journald
  hostname: f31
  kernel: 5.4.17-200.fc31.x86_64
  os: linux
  rootless: false
  uptime: 45h 48m 32.9s (Approximately 1.88 days)
registries:
  search:
  - docker.io
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - registry.centos.org
  - quay.io
store:
  ConfigFile: /etc/containers/storage.conf
  ContainerStore:
    number: 5
  GraphDriverName: overlay
  GraphOptions:
    overlay.mountopt: nodev,metacopy=on
  GraphRoot: /var/lib/containers/storage
  GraphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "true"
  ImageStore:
    number: 9
  RunRoot: /var/run/containers/storage
  VolumePath: /var/lib/containers/storage/volumes

Package info (e.g. output of rpm -q podman or apt list podman):

podman-1.8.0-2.fc31.x86_64

Additional environment details (AWS, VirtualBox, physical, etc.):
qemu virtual machine.