fcos: Upgrade etcd to v3.4.6, use quay.io/coreos/etcd

The tags on quay.io/coreos/etcd follow the same format as
https://github.com/etcd-io/etcd/releases compared to k8s.gcr.io which
modifies the canonical version tag by dropping the "v" prefix.

Story: 2007475
Task: 39184

Change-Id: If44eb55a68c13f8e1706242c099578ed1f264d62

doc/source/user/index.rst

@@ -1188,7 +1188,7 @@ _`container_infra_prefix`
   Images that must be mirrored:
 
   * docker.io/coredns/coredns
-  * docker.io/openstackmagnum/etcd
+  * quay.io/coreos/etcd
   * docker.io/openstackmagnum/flannel
   * docker.io/openstackmagnum/kubernetes-apiserver
   * docker.io/openstackmagnum/kubernetes-controller-manager
@@ -1270,9 +1270,11 @@ _`cloud_provider_tag`
 _`etcd_tag`
   This label allows users to select `a specific etcd version,
   based on its container tag
-  <https://hub.docker.com/r/openstackmagnum/etcd/tags/>`_.
+  <https://quay.io/repository/coreos/etcd?tab=tags>`_.
   If unset, the current Magnum version's a default etcd version.
-  For queens, v3.2.7
+  Stein default: v3.2.7
+  Train default: 3.2.26
+  Ussuri default: v3.4.6
 
 _`coredns_tag`
   This label allows users to select `a specific coredns version,

magnum/drivers/common/templates/kubernetes/fragments/configure-etcd.sh

@@ -66,7 +66,7 @@ ExecStart=/bin/podman run \\
     --volume /etc/etcd:/etc/etcd:ro,z \\
     --volume /var/lib/etcd:/var/lib/etcd:rshared,z \\
     --net=host \\
-    ${CONTAINER_INFRA_PREFIX:-"k8s.gcr.io/"}etcd:${ETCD_TAG} \\
+    ${CONTAINER_INFRA_PREFIX:-"quay.io/coreos/"}etcd:${ETCD_TAG} \\
     /usr/local/bin/etcd \\
     --config-file /etc/etcd/etcd.conf.yaml
 ExecStop=/bin/podman stop etcd

magnum/drivers/k8s_fedora_coreos_v1/templates/kubecluster.yaml

@@ -469,7 +469,7 @@ parameters:
   etcd_tag:
     type: string
     description: tag of the etcd system container
-    default: 3.2.26
+    default: v3.4.6
 
   coredns_tag:
     type: string

releasenotes/notes/upgrade-etcd-and-use-quay-io-coreos-etcd-1cb8e38e974f5975.yaml

@@ -0,0 +1,9 @@
+---
+upgrade:
+  - |
+    Upgrade etcd to v3.4.6 and use quay.io/coreos/etcd since the tags on follow
+    the same format as https://github.com/etcd-io/etcd/releases compared to
+    k8s.gcr.io which modifies the canonical version tag. Users will need to pay
+    attention to the format of etcd_tag, e.g. v3.4.5 is valid whereas 3.4.5 is
+    not. Existing cluster templates and clusters which which use the latter will
+    fail to complete.