upgrade openssl to resolve CVE-2015-1793
upgrade openssl to resolve CVE-2015-1793

Before this commit, we simply install latest version
of openssl as a dependency of ca-certificates.

After this commit, pin openssl to make it clear which
version is installed.

jumanjiman/puppet-on-coreos,epfl-sti/cluster.coreos.puppet,epfl-sti/cluster.coreos.puppet,epfl-sti/cluster.coreos.puppet,jumanjihouse/puppet-on-coreos