runner/rootfs: Install go, godep, mercurial, git
runner/rootfs: Install go, godep, mercurial, git

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>
flynn-archive/flynn-test,flynn-archive/flynn-test,flynn-archive/flynn-test