Cannot delete custom network using TCP API because ip not installed in Podman image

[mattymo]

/kind bug

Description
This problem occurs when using quay.io/podman/stable:v3.3.0

# docker --debug network rm testapp-245072058098
Error response from daemon: failed to delete the network interface "cni-podman1": exec: "ip": executable file not found in $PATH

Podman logs with debug enabled:

time="2021-09-02T07:22:15Z" level=info msg="APIHandler(dbecbfa5-7c84-487d-8654-c490d4720f64) -- DELETE /v1.40/networks/a7ed2df3f684 BEGIN"
time="2021-09-02T07:22:15Z" level=debug msg="APIHandler(dbecbfa5-7c84-487d-8654-c490d4720f64) -- Header: Accept=[*/*]"
time="2021-09-02T07:22:15Z" level=debug msg="APIHandler(dbecbfa5-7c84-487d-8654-c490d4720f64) -- Header: Connection=[Keep-Alive]"
time="2021-09-02T07:22:15Z" level=debug msg="APIHandler(dbecbfa5-7c84-487d-8654-c490d4720f64) -- Header: User-Agent=[Apache-HttpClient/4.5.10 (Java/11.0.12)]"
time="2021-09-02T07:22:15Z" level=debug msg="APIHandler(dbecbfa5-7c84-487d-8654-c490d4720f64) -- Header: Accept-Encoding=[gzip,deflate]"
time="2021-09-02T07:22:15Z" level=info msg="Request Failed(Internal Server Error): failed to delete the network interface \"cni-podman1\": exec: \"ip\": executable file not found in $PATH"
time="2021-09-02T07:22:15Z" level=debug msg="APIHandler(dbecbfa5-7c84-487d-8654-c490d4720f64) -- DELETE /v1.40/networks/a7ed2df3f684 END"

Output of podman info --debug:

host:
  arch: amd64
  buildahVersion: 1.22.3
  cgroupControllers:
  - cpuset
  - cpu
  - cpuacct
  - memory
  - devices
  - freezer
  - net_cls
  - blkio
  - perf_event
  - hugetlb
  - pids
  - net_prio
  cgroupManager: cgroupfs
  cgroupVersion: v1
  conmon:
    package: conmon-2.0.29-2.fc34.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.0.29, commit: '
  cpus: 56
  distribution:
    distribution: fedora
    version: "34"
  eventLogger: file
  hostname: component-skeleton-dev-null-el7-244-b451121d-lbj57-7j316
  idMappings:
    gidmap: null
    uidmap: null
  kernel: 3.10.0-1127.8.2.el7.x86_64
  linkmode: dynamic
  memFree: 443130503168
  memTotal: 540768747520
  ociRuntime:
    name: crun
    package: crun-0.21-1.fc34.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 0.21
      commit: c4c3cdf2ce408ed44a9e027c618473e6485c635b
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
  os: linux
  remoteSocket:
    path: /run/podman/podman.sock
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: false
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: false
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.1.12-2.fc34.x86_64
    version: |-
      slirp4netns version 1.1.12
      commit: 7a104a101aa3278a2152351a082a6df71f57c9a3
      libslirp: 4.4.0
      SLIRP_CONFIG_VERSION_MAX: 3
      libseccomp: 2.5.0
  swapFree: 0
  swapTotal: 0
  uptime: 3216h 55m 18.06s (Approximately 134.00 days)
registries:
  platform-docker-repo.ap.int.zone:
    Blocked: false
    Insecure: true
    Location: platform-docker-repo.ap.int.zone
    MirrorByDigestOnly: false
    Mirrors: null
    Prefix: platform-docker-repo.ap.int.zone
  search:
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - docker.io
  - quay.io
store:
  configFile: /etc/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions:
    overlay.imagestore: /var/lib/shared
    overlay.mount_program:
      Executable: /usr/bin/fuse-overlayfs
      Package: fuse-overlayfs-1.7.1-1.fc34.x86_64
      Version: |-
        fusermount3 version: 3.10.4
        fuse-overlayfs: version 1.7.1
        FUSE library version 3.10.4
        using FUSE kernel interface version 7.31
    overlay.mountopt: nodev,fsync=0
  graphRoot: /var/lib/containers/storage
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "false"
  imageStore:
    number: 8
  runRoot: /run/containers/storage
  volumePath: /var/lib/containers/storage/volumes
version:
  APIVersion: 3.3.0
  Built: 1629488174
  BuiltTime: Fri Aug 20 19:36:14 2021
  GitCommit: ""
  GoVersion: go1.16.6
  OsArch: linux/amd64
  Version: 3.3.0

This was apparently present in the image in the past #3886 but it got dropped

[Luap99]

I take this, there is no point in using ip anyway. We should talk directly to the kernel.