When pip is upgraded to 20.3, the pip dependency resolver is much more
strict and will no longer install a combination of packages that is mutually
inconsistent[0].
These changes account for the fact that Shipyard imports Armada, Drydock,
Promenade, and Deckhand. Having said that, with pip 20.3, the pip
packages amongst those projects cannot conflict. A follow-up change may
be needed if more conflicts are found.
Change-Id: Idd9ea0d57b5be063b133036cfc9ebaa69956f4fc