Update signing key for percona packages

Percona has started signing their Ubuntu packages with a new key.
Update the galera_gpg_keys var to add it to the keyring.

https://www.percona.com/blog/2016/10/13/new-signing-key-for-percona-debian-and-ubuntu-packages/

To resolve a reno dependency required to pass gate testing, also include
the libjpeg-dev package in bindep requirements.

Also, due to an expired certificate being used for
https://yum.mariadb.org the GPG key is set to be
fetched via http.

Related-Bug: #388205
Change-Id: I1dc3a78b8e0b759cc98f3de2bd33774db3b477da
(cherry picked from commit 6eb67a2420)

vars/redhat-7.yml

@@ -17,7 +17,7 @@
 galera_gpg_keys:
   - key_name: 'RPM-GPG-KEY-MariaDB'
     keyserver: 'https://yum.mariadb.org'
-    fallback_keyserver: 'https://yum.mariadb.org'
+    fallback_keyserver: 'http://yum.mariadb.org'
 
 galera_server_required_distro_packages:
   - gnupg2
@@ -50,7 +50,7 @@ galera_repo:
   description: "MariaDB Repo"
   file: MariaDB
   baseurl: "{{ galera_yum_repo_url }}"
-  gpgkey: "https://yum.mariadb.org/RPM-GPG-KEY-MariaDB"
+  gpgkey: "http://yum.mariadb.org/RPM-GPG-KEY-MariaDB"
 
 galera_percona_xtrabackup_repo:
   repo: "http://www.percona.com/downloads/percona-release/redhat/0.1-3/percona-release-0.1-3.noarch.rpm"

vars/ubuntu-14.04.yml

@@ -27,7 +27,7 @@ galera_gpg_keys:
   - key_name: 'percona-xtrabackup'
     keyserver: 'hkp://keyserver.ubuntu.com:80'
     fallback_keyserver: 'hkp://p80.pool.sks-keyservers.net:80'
-    hash_id: '0x1c4cbdcdcd2efd2a'
+    hash_id: '0x9334a25f8507efa5'
 
 galera_server_required_distro_packages:
   - apt-transport-https

vars/ubuntu-16.04.yml

@@ -27,7 +27,7 @@ galera_gpg_keys:
   - key_name: 'percona-xtrabackup'
     keyserver: 'hkp://keyserver.ubuntu.com:80'
     fallback_keyserver: 'hkp://p80.pool.sks-keyservers.net:80'
-    hash_id: '0x1c4cbdcdcd2efd2a'
+    hash_id: '0x9334a25f8507efa5'
 
 galera_server_required_distro_packages:
   - apt-transport-https