Use gzip compression in Ubuntu packages to make it at least possible to install on Lucid.

Docker-DCO-1.1-Signed-off-by: Evan Krall <krall@yelp.com> (github: EvanKrall)
Merge pull request #3543 from EvanKrall/gzip_debs

Use gzip compression in Ubuntu packages to make it possible to install on Lucid