This is particularly important for debuntu where we need working gpg for
apt and a missing gpg-agent is fatal. We install it globally so that
consistent tooling is available across systems.
Note everyone but suse seems to have a gnupg2 package. Suse calls it
gpg2.
Change-Id: I6c56e85db501f2c9d7c648e614f1efbaadc213a2
a8a41f162f