the repository gpg key should be imported

[Jeffrey Zhang]

We don't add the gpg key for the added repos. So it raised error like blow.

Downloading packages:
warning: /var/cache/yum/x86_64/7/mariadb/packages/MariaDB-10.0.22-centos7-x86_64-common.rpm: Header V4 DSA/SHA1 Signature, key ID 1bb943db: NOKEY
Public key for MariaDB-10.0.22-centos7-x86_64-common.rpm is not installed
warning: /var/cache/yum/x86_64/7/percona-release-x86_64/packages/Percona-Server-devel-56-5.6.27-rel76.0.el7.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID cd2efd2a: NOKEY
Public key for Percona-Server-devel-56-5.6.27-rel76.0.el7.x86_64.rpm is not installed
--------------------------------------------------------------------------------
Total 1.8 MB/s | 51 MB 00:27
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-Percona
Importing GPG key 0xCD2EFD2A:
 Userid : "Percona MySQL Development Team <email address hidden>"
 Fingerprint: 430b df5c 56e7 c94e 848e e60c 1c4c bdcd cd2e fd2a
 Package : percona-release-0.1-3.noarch (@/percona-release-0.1-3.noarch)
 From : /etc/pki/rpm-gpg/RPM-GPG-KEY-Percona
Retrieving key from https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
Importing GPG key 0x1BB943DB:
 Userid : "MariaDB Package Signing Key <email address hidden>"
 Fingerprint: 1993 69e5 404b d5fc 7d2f e43b cbcb 082a 1bb9 43db
 From : https://yum.mariadb.org/RPM-GPG-KEY-MariaDB

the keys from ceph repo, mariadb repo and epel repo should be imported.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/256244
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=551c0fa2ced1f76cd775a9b51d5c50978c4ef78c
Submitter: Jenkins
Branch: master

commit 551c0fa2ced1f76cd775a9b51d5c50978c4ef78c
Author: Jeffrey Zhang <email address hidden>
Date: Fri Dec 11 10:56:51 2015 +0800

    import the rpm gpg key

    this will purge the package pgp key warning

    Closes-Bug: #1525276
    Change-Id: I956c8b0b6f1e1bfbceaa6abc06da16a980f023c1