Align the stars to bring our CI back alive

This patch squash 2 commits to bring our CI back:

1) Pin Tempest to latest working commit:

https://review.openstack.org/#/c/297511/ broke us, we need to pin
Tempest to keep rolling.
This will be reverted once we sort things out.

2) rabbitmq: install packages from distro repos

Stop installing RabbitMQ from rabbitmq.com repository.

rabbitmq.com is providing a terrible and frustrating experience of
packaging repository:
* rabbitmq.com is very often down and we have to recheck our jobs
  everytime it happens.
* packaging signature is currently broken, see [1].

From this patch, we'll deploy RabbitMQ using distro repositories.

[1] https://github.com/puppetlabs/puppetlabs-rabbitmq/pull/476

Change-Id: I1e79c04d7cd796493ae56423b70626e8841cf284

manifests/rabbitmq.pp

@@ -25,6 +25,7 @@ class openstack_integration::rabbitmq {
       ssl_cert              => $::openstack_integration::params::cert_path,
       ssl_key               => "/etc/rabbitmq/ssl/private/${::fqdn}.pem",
       environment_variables => $::openstack_integration::config::rabbit_env,
+      repos_ensure          => false,
     }
   } else {
     class { '::rabbitmq':

run_tests.sh

@@ -198,6 +198,11 @@ TESTS="${TESTS} TestManageQueue"
 
 print_header 'Running Tempest'
 cd /tmp/openstack/tempest
+
+# https://review.openstack.org/#/c/297511/ broke our gate
+# we pin Tempest until we sort this out.
+git checkout a3c7945a5fff6be018de7a56a3faa59acc29f6bc
+
 tox -eall-plugin -- --concurrency=2 $TESTS
 RESULT=$?
 set -e