Add "git" to our Ubuntu package "Recommends" (whoops, this should've been in here for a while now)

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)

hack/make/ubuntu

@@ -115,6 +115,7 @@ EOF
 		    --depends iptables \
 		    --deb-recommends aufs-tools \
 		    --deb-recommends ca-certificates \
+		    --deb-recommends git \
 		    --deb-recommends xz-utils \
 		    --description "$PACKAGE_DESCRIPTION" \
 		    --maintainer "$PACKAGE_MAINTAINER" \