[PATCH 0/6 Xenial SRU] Fix derivatives build after tools-common removal

[Thadeu Lima de Souza Cascardo]

BugLink: https://bugs.launchpad.net/bugs/1691814

After the introduction of "UBUNTU: [Packaging] prevent linux-*-tools-common
from being produced from non linux packages", derivatives started failing to build.

The following patchset fixes that.

I plan to apply the first patch to master-next and, temporarily to all
derivatives. The other patches apply to their respective branches.

Regards.
Cascardo.