Fix monasca-grafana, fluentd and sensu images

1. monasca-grafana - pin rake to <13

Rake 13.0.0 (released today) depends on Ruby 2.2, but CentOS 7 only
provides Ruby 2.0.

This change pins rake in the monasca-grafana image to versions earlier
than 13.0.0.

2. fluentd on Ubuntu - pin faraday to <0.16

Rocky and earlier only.

Faraday 0.16.x depends on Ruby 2.3+, but td-agent on Ubuntu uses its own
old version of Ruby.

This change pins faraday in the Ubuntu and Debian fluentd images to
versions earlier than 0.16.

3. sensu-client: Pin minitest Ruby gem on CentOS

This was originally in change I1afd2d50c0dc2de6d305b56bd5f9182745fee843
on master and stable/stein.

(cherry picked from commit 305312f107)

Change-Id: Id9a76f459aff016fbc920370c0a3ec58e0397fcb
Closes-Bug: #1845647
Closes-Bug: #1845705
Closes-bug: #1845843
(cherry picked from commit a0712ceef3)

docker/fluentd/Dockerfile.j2

@@ -60,7 +60,11 @@ RUN chmod 755 /usr/local/bin/kolla_extend_start
 {% block fluentd_plugins_install %}
 
 {% if base_distro in ['debian', 'ubuntu'] %}
+# NOTE(mgoddard): fluent-plugin-elasticsearch requires faraday, which from
+# 0.16.0 depends on Ruby 2.3, but td-agent provides its own older version of
+# Ruby.
     {% set fluentd_plugins = [
+        'faraday:"~>0.15.4"',
         'fluent-plugin-elasticsearch',
         'fluent-plugin-grep',
         'fluent-plugin-grok-parser:2.1.4',

docker/monasca/monasca-grafana/Dockerfile.j2

@@ -48,7 +48,9 @@ ARG monasca_grafana_version=grafana4
 ARG monasca_grafana_url=https://github.com/monasca/grafana/archive/$monasca_grafana_version.tar.gz
 
 {% block monasca_grafana_install %}
-RUN gem install rake fpm \
+# NOTE(mgoddard): Pinning rake because rake 13.0.0 depends on Ruby 2.2, and CentOS 7 only provides
+# Ruby 2.0.
+RUN gem install rake:"~>12" fpm \
     && curl -sSL -o /tmp/monasca-grafana.tgz ${monasca_grafana_url} \
     && mkdir -p ${monasca_grafana_build_path} \
     && tar --strip 1 -xvf /tmp/monasca-grafana.tgz -C ${monasca_grafana_build_path} \

docker/sensu/sensu-client/Dockerfile.j2

@@ -78,7 +78,8 @@ RUN echo '{{ image_name }} not yet available for {{ base_distro }}' \
 # TODO(mandre) Use packaged sensu plugins from centos-opstools for binary distro
 # http://cbs.centos.org/koji/search?match=glob&type=package&terms=*sensu*
 # NOTE(hrw): whois 5.0.0 requires Ruby 2.4+ while CentOS has 2.0
-RUN {%if base_distro in ['centos', 'rhel', 'oraclelinux'] %} gem install whois:"<5" && {% endif %} sensu-install --plugins {{ sensu_plugins | customizable('plugins') | join (',') }}
+# NOTE(yoctozepto): pinning minitest for the same reason
+RUN {%if base_distro in ['centos', 'rhel', 'oraclelinux'] %} gem install whois:"<5" minitest:"~>5.11.3" && {% endif %} sensu-install --plugins {{ sensu_plugins | customizable('plugins') | join (',') }}
 {% endblock %}
 
 {% block sensu_client_footer %}{% endblock %}