pip install error in building the container runtime when installing devstack

When I tried to install Tacker by devstack with kubernetes as VIM(Virtualized Infrastructure Manager), an error occurred in pip install when building the container runtime with the installation of kuryr-kubernetes.
Therefore, after taking temporary fixes based on the error content, the installation was successful.
Details are given below, so could you check these.

- devstack installation procedure
https://docs.openstack.org/tacker/latest/install/kubernetes_vim_installation.html

- Environment specifications
OS: Ubuntu 20.04.4 LTS
CPU: 4CPU
Memory: 16GB
Storage: 50GB

- local.conf (excerpt of the part related to kuryr-kubernetes)
https://opendev.org/openstack/tacker/src/branch/master/devstack/local.conf.kubernetes
```
# Enable kuryr-kubernetes, docker, octavia
KUBERNETES_VIM=True
enable_plugin kuryr-kubernetes https://opendev.org/openstack/kuryr-kubernetes master
enable_plugin octavia https://opendev.org/openstack/octavia master
enable_plugin devstack-plugin-container https://opendev.org/openstack/devstack-plugin-container master
#KURYR_K8S_CLUSTER_IP_RANGE="10.0.0.0/24"
enable_service kubernetes-master
enable_service kuryr-kubernetes
enable_service kuryr-daemon
```

- Error contents
```
Step 12/17 : RUN pip3 --no-cache-dir install -U pip && python3 -m pip --no-cache-dir install -c $UPPER_CONSTRAINTS_FILE /opt/kuryr-kubernetes && cp /opt/kuryr-kubernetes/cni_ds_init /usr/bin/cni_ds_init && mkdir -p /etc/kuryr-cni && cp /opt/kuryr-kubernetes/etc/cni/net.d/* /etc/kuryr-cni && dnf -y history undo last && dnf clean all && rm -rf /opt/kuryr-kubernetes && mkdir ${OSLO_LOCK_PATH}
...snip...
Collecting setuptools
  Downloading setuptools-62.3.2-py3-none-any.whl (1.2 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.2/1.2 MB 18.2 MB/s eta 0:00:00
...snip...
  Attempting uninstall: setuptools
    Found existing installation: setuptools 57.4.0
ERROR: Cannot uninstall setuptools 57.4.0, RECORD file not found. Hint: The package was installed by rpm.
The command '/bin/sh -c pip3 --no-cache-dir install -U pip && python3 -m pip --no-cache-dir install -c $UPPER_CONSTRAINTS_FILE /opt/kuryr-kubernetes && cp /opt/kuryr-kubernetes/cni_ds_init /usr/bin/cni_ds_init && mkdir -p /etc/kuryr-cni && cp /opt/kuryr-kubernetes/etc/cni/net.d/* /etc/kuryr-cni && dnf -y history undo last && dnf clean all && rm -rf /opt/kuryr-kubernetes && mkdir ${OSLO_LOCK_PATH}' returned a non-zero code: 1
++ /opt/stack/kuryr-kubernetes/devstack/lib/kuryr_kubernetes:container_runtime:33 : die 33 'Error when running docker command'
++ functions-common:die:264 : local exitcode=1
[Call Trace]
./stack.sh:1403:run_phase
/opt/stack/devstack/functions-common:1881:run_plugins
/opt/stack/devstack/functions-common:1848:source
/opt/stack/kuryr-kubernetes/devstack/plugin.sh:92:build_kuryr_container_image
/opt/stack/kuryr-kubernetes/devstack/lib/kuryr_kubernetes:326:container_runtime
/opt/stack/kuryr-kubernetes/devstack/lib/kuryr_kubernetes:33:die
[ERROR] /opt/stack/kuryr-kubernetes/devstack/lib/kuryr_kubernetes:33 Error when running docker command
Error on exit
```

- Temporary fixes
In cni.Dockerfil used to build the container runtime, it seemed that setuptools failed to install via pip, so I removed the conflicting rpm package before that.
```
$ git diff
diff --git a/cni.Dockerfile b/cni.Dockerfile
index 32729da4..60a3d58b 100644
--- a/cni.Dockerfile
+++ b/cni.Dockerfile
@@ -18,6 +18,8 @@ RUN dnf upgrade -y && dnf install -y epel-release $RDO_REPO \

 COPY . /opt/kuryr-kubernetes

+RUN dnf remove -y python-setuptools
+
 RUN pip3 --no-cache-dir install -U pip \
     && python3 -m pip --no-cache-dir install -c $UPPER_CONSTRAINTS_FILE /opt/kuryr-kubernetes \
     && cp /opt/kuryr-kubernetes/cni_ds_init /usr/bin/cni_ds_init \
```