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node: replace nullid and friends with nodeconstants class [WIP]

Authored by joerg.sonnenberger.

Description

node: replace nullid and friends with nodeconstants class [WIP]

The introduction of 256bit hashes require changes to nullid and other
constant magic values. Start pushing them down from repository and
revlog where sensible.

Note: this review contains two parts for correctness checks that need to
be removed before the final merge. There are a couple of asserts in the
manifest classes etc to ensure that the nodeconstants argument is sane.
This ensured the correct API update. The other part is commenting out
the legacy names in node.py. That will move under an environment flag
for now and is not intended for the repo as is. The rest of the
changeset is reviewable.

Differential Revision: https://phab.mercurial-scm.org/D9465