Ubuntu beaker rspec are broken, as ceph point to wrong repo.

[Sofer Athlan-Guyot]

Hi,

The ceph repo for Ubunto was broken and pointed to http://mirror.centos.org/centos/7/storage/x86_64/ceph-jewel/dists/xenial/main/binary-amd64/Packages [1].

Furthermore epel/sig activation/deactivation makes no sense on Ubuntu platform.

[1] http://logs.openstack.org/65/432165/19/check/gate-puppet-vswitch-puppet-beaker-rspec-ubuntu-xenial/daad266/console.html#_2017-04-03_05_13_45_306095

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/452630
Committed: https://git.openstack.org/cgit/openstack/puppet-openstack-integration/commit/?id=f11afc4ff308cd81c9bee56b147bf24028682e11
Submitter: Jenkins
Branch: master

commit f11afc4ff308cd81c9bee56b147bf24028682e11
Author: Sofer Athlan-Guyot <email address hidden>
Date: Mon Apr 3 10:15:36 2017 +0200

    Separate RHEL from Ubuntu code and fix Ubuntu ceph default repo url.

    The ceph repo for Ubunto was broken and pointed to
    http://mirror.centos.org/centos/7/storage/x86_64/ceph-jewel/dists/xenial/main/binary-amd64/Packages
    [1].

    Furthermore epel activation/deactivation makes no sense on Ubuntu
    platform.

    [1] http://logs.openstack.org/65/432165/19/check/gate-puppet-vswitch-puppet-beaker-rspec-ubuntu-xenial/daad266/console.html#_2017-04-03_05_13_45_306095

    Closes-Bug: #1678932

    Change-Id: I5d3c75b14145d3f55eec5f019b962cc4888404e5