Install etcd binary from github

Removes a dependency on RDO for install etcd in CentOS images.

Aligns version of etcd across all distributions, see below:

```
(venv-kolla) [will@juno kolla]$ docker run --rm -it kolla/ubuntu-source-etcd:yoga bash
()[etcd@730a011b670a /]$ etcd --version
etcd Version: 3.2.26
Git SHA: Not provided (use ./build instead of go build)
Go Version: go1.13.7
Go OS/Arch: linux/amd64
```

```
(venv-kolla) [will@juno kolla]$ sudo docker run -it kolla/centos-source-etcd:yoga bash
()[etcd@9aa486c9e94f /]$ etcd --version
etcd Version: 3.2.21
Git SHA: 3ac81f3
Go Version: go1.12.8
Go OS/Arch: linux/amd64
```

```
(venv-kolla) [will@juno kolla]$ docker run --rm -it kolla/debian-source-etcd:yoga bash
()[etcd@b49cb5fcdf87 /]$ etcd --version
etcd Version: 3.3.25
Git SHA: Not provided (use ./build instead of go build)
Go Version: go1.15.9
Go OS/Arch: linux/amd64
```

This will also allow us to update to a more recent version in the
future. We have to be careful not to jump by more than one point release
to ensure compatibility:

https://etcd.io/docs/v3.5/upgrades/upgrading-etcd/#upgrading-an-etcd-v3x-cluster

Change-Id: I62a34256fb7395d0448af169ac3cf036f60cd290

1 files changed, 10 insertions, 6 deletions

diff --git a/docker/etcd/Dockerfile.j2 b/docker/etcd/Dockerfile.j2
index dc39acbe2..6f55b0b15 100644
--- a/docker/etcd/Dockerfile.j2
+++ b/docker/etcd/Dockerfile.j2
@@ -9,12 +9,16 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 
 {{ macros.configure_user(name='etcd') }}
 
-{% if base_package_type == 'rpm' %}
-    {% set etcd_packages = ['etcd'] %}
-{% elif base_package_type == 'deb' %}
-    {% set etcd_packages = ['etcd'] %}
-{% endif %}
-{{ macros.install_packages(etcd_packages | customizable("packages")) }}
+{% block etcd_repository_version %}
+# NOTE(wszumski): It is suggested to upgrade one minor version at a time:
+# https://github.com/etcd-io/website/blob/3e04053d1cb15b2ddc2904ba4121ca5aa73bea66/content/en/docs/v3.3/upgrades/upgrade_3_3.md#upgrade-requirements
+ARG etcd_version=v3.3.27
+ARG etcd_url=https://github.com/etcd-io/etcd/releases/download/${etcd_version}/etcd-${etcd_version}-linux-{{debian_arch}}.tar.gz
+{% endblock %}
+
+RUN curl ${etcd_url} -o /tmp/etcd.tar.gz \
+    && tar -C /usr/bin -xvz --strip-components=1 --wildcards '*/etcd' --wildcards '*/etcdctl' -f /tmp/etcd.tar.gz \
+    && rm -f /tmp/etcd.tar.gz
 
 COPY etcd_sudoers /etc/sudoers.d/kolla_etcd_sudoers
 COPY extend_start.sh /usr/local/bin/kolla_extend_start