Update gitlab.yml template for 7.2
Fetch cacert.pem on every build

Because of the way this file gets updated upstream we do not want to
cache it on our build machines.
Vendor cacerts software definition

Source:
https://github.com/opscode/omnibus-software/blob/b6a31414b3aabe98e428090b735f0ad825336d6f/config/software/cacerts.rb
Merge branch 'update/cacerts' into 'master'

Update cacerts to 20140820

See merge request !187
Merge branch 'update_templates' into 'master'

Update templates

In preparation for 7.2 release

See merge request !188