build packages in one go by moving individual .deb targets into install
targets called by dpkg-buildpackage.
ported from pve-docs:fa764571f6a0c5bfc62ee1cda6bffcfae40e9ec9
and pve-docs:60955877b11cde0865a258ece040bd124fb07bdc
Additionally I added the fixups from Thomas in
pve-docs:2d11c86883c4b1150afcc97eedfbf1b2a07de105
pve-docs:fd880d44c7d3876add7acd659641668bfa09c71b
Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>