Update Centos version for container images.

Due to the EOL for Centos 8, we need to go forward, and adopt to the
Stream version of Centos for container images of kuryr CNI and
controller.

There was applied modification for fixing (hopefully transient) issues
with variable usage in yum/dnf, so there is a need for replacing those
manually.

And finally, there was a switch from deprecated yum to dnf.

Change-Id: I19c16877e8ba6f401c9d76ed70b2380c4e3cfbe0

cni.Dockerfile

@@ -5,17 +5,22 @@ COPY . .
 
 RUN GO111MODULE=auto go build -o /go/bin/kuryr-cni ./kuryr_cni/pkg/*
 
-FROM registry.centos.org/centos:8
+FROM quay.io/centos/centos:stream8
 LABEL authors="Antoni Segura Puimedon<toni@kuryr.org>, Michał Dulko<mdulko@redhat.com>"
 
 ARG UPPER_CONSTRAINTS_FILE="https://releases.openstack.org/constraints/upper/master"
 ARG OSLO_LOCK_PATH=/var/kuryr-lock
-ARG PKG_YUM_REPO=https://rdoproject.org/repos/openstack-victoria/rdo-release-victoria-2.el8.noarch.rpm
+ARG RDO_REPO=https://repos.fedorapeople.org/repos/openstack/openstack-xena/rdo-release-xena-1.el8.noarch.rpm
 
-RUN yum upgrade -y \
+# NOTE(gryf): There is a sed substitution to make package manager to
-    && yum install -y epel-release $PKG_YUM_REPO \
+# cooperate. It might be a subject to change in the future, either when
-    && yum install -y --setopt=tsflags=nodocs python3-pip openvswitch sudo iproute libstdc++ pciutils kmod-libs \
+# yum/dnf starts to respect yum.conf variables, or mirror location would
-    && yum install -y --setopt=tsflags=nodocs gcc gcc-c++ python3-devel git
+# change.
+RUN dnf upgrade -y && dnf install -y epel-release $RDO_REPO \
+    && sed -e 's/$releasever/8-stream/' -i /etc/yum.repos.d/messaging.repo \
+    && sed -e 's/$basearch/x86_64/' -i /etc/yum.repos.d/messaging.repo \
+    && dnf install -y --setopt=tsflags=nodocs python3-pip openvswitch sudo iproute libstdc++ pciutils kmod-libs \
+    && dnf install -y --setopt=tsflags=nodocs gcc gcc-c++ python3-devel git
 
 COPY . /opt/kuryr-kubernetes
 
@@ -24,8 +29,8 @@ RUN pip3 --no-cache-dir install -U pip \
     && 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 \
-    && yum -y history undo last \
+    && dnf -y history undo last \
-    && yum clean all \
+    && dnf clean all \
     && rm -rf /opt/kuryr-kubernetes \
     && mkdir ${OSLO_LOCK_PATH}
 

controller.Dockerfile

@@ -1,19 +1,19 @@
-FROM registry.centos.org/centos:8
+FROM quay.io/centos/centos:stream8
 LABEL authors="Antoni Segura Puimedon<toni@kuryr.org>, Michał Dulko<mdulko@redhat.com>"
 
 ARG UPPER_CONSTRAINTS_FILE="https://releases.openstack.org/constraints/upper/master"
 
-RUN yum upgrade -y \
+RUN dnf upgrade -y \
-    && yum install -y epel-release \
+    && dnf install -y epel-release \
-    && yum install -y --setopt=tsflags=nodocs python3-pip libstdc++ \
+    && dnf install -y --setopt=tsflags=nodocs python3-pip libstdc++ \
-    && yum install -y --setopt=tsflags=nodocs gcc gcc-c++ python3-devel git
+    && dnf install -y --setopt=tsflags=nodocs gcc gcc-c++ python3-devel git
 
 COPY . /opt/kuryr-kubernetes
 
 RUN pip3 --no-cache-dir install -U pip \
     && python3 -m pip install -c $UPPER_CONSTRAINTS_FILE --no-cache-dir /opt/kuryr-kubernetes \
-    && yum -y history undo last \
+    && dnf -y history undo last \
-    && yum clean all \
+    && dnf clean all \
     && rm -rf /opt/kuryr-kubernetes \
     && groupadd -r kuryr -g 711 \
     && useradd -u 711 -g kuryr \