The package list has some "strange" things in them, but more important is
using the same list everywhere.  We can hopefully harmonise the package lists
to a single file in Samba git soom, merging the docker and packer image creation.

Additionally, Travis CI will probably need to move to Docker once we change
beyond Ubuntu 14.04, so it will simple reference the gitlab.com image then.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>

Autobuild-User(master): Gary Lockyer <gary@samba.org>
Autobuild-Date(master): Wed Jun 27 07:51:14 CEST 2018 on sn-devel-144