Bug 31675: Remove packages from debian/control that are no longer used

Bug 31675: Remove packages from debian/control that are no longer used

As far as I can tell, we are no longer using CGI::Session::Serialize::YAML or YAML::Syck, but they are still marked dependencies for the Debian package.

Signed-off-by: Danyon Sewell <danyonsewell@catalyst.net.nz>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jacob O'Mara <jacob.omara@ptfs-europe.com>
(cherry picked from commit 56ecfc55fc9850cd3bbfbae0e850f864c5a78fe3)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>