Add ca-certificates update to the integration deps playbook

test/utils/ansible-playbook_integration_runner/roles/ansible_test_deps/tasks/main.yml

@@ -53,6 +53,10 @@
     - python-virtualenv
   when: ansible_os_family == 'Debian'
 
+- name: update ca certificates
+  yum: name=ca-certificates state=latest
+  when: ansible_os_family == 'RedHat'
+
 - name: Install ubuntu 12.04 ansible dependencies
   apt: name="{{ item }}" state=installed update_cache=yes
   sudo: true