dnf in CentOS 7 doesn't support version locks

[Major Hayden]

The version of dnf in CentOS 7 does not have support for version locks. This is breaking the rabbitmq_server role.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/504266

[Major Hayden (rackerhacker)]

Thanks to Markos for finding this one. ;)

[Major Hayden (rackerhacker)]

Raised a bug with the EPEL maintainer: https://bugzilla.redhat.com/show_bug.cgi?id=1491872

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/504266
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-rabbitmq_server/commit/?id=a74c237cf717246d659cef241a5d09096cbbc2a0
Submitter: Jenkins
Branch: master

commit a74c237cf717246d659cef241a5d09096cbbc2a0
Author: Major Hayden <email address hidden>
Date: Thu Sep 14 16:26:25 2017 -0600

    Use yum whe installing RabbitMQ

    The version of dnf that comes with CentOS 7 does not come with
    versionlock support. This causes the locks for RabbitMQ and erlang
    to be ignored, which breaks the gate.

    Closes-Bug: 1717376
    Change-Id: Ifd8cd5a7f26c044564b5e8f64398f59636d62200

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/openstack-ansible-rabbitmq_server 17.0.0.0b1 development milestone.