UBUNTU: [Debian] Use default compression for all packages

UBUNTU: [Debian] Use default compression for all packages

BugLink: http://bugs.launchpad.net/bugs/1686782
Currently we specify bzip2 compression for the main and extras
packages, but bzip2 is no longer permitted in artful and causes
a ftbfs. Switch to the default compression.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Acked-by: Andy Whitcroft <andy.whitcroft@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>