Maven: expose configuration of automatic archiving.

By default, Maven projects are configured to automatically
archive maven artifacts.

This commit exposes an option to configure that behavior in
a backward compatible way. By default, automatic archiving
is active, which means writing false in the XML configuration,
since the element name is "archivingDisabled".

Change-Id: I35e8a035a53356d7c171735aa5a52c6c429d1608
Reviewed-on: https://review.openstack.org/33367
Reviewed-by: Antoine Musso <hashar@free.fr>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins