regen without api-commons-proto (#150)

See: https://github.com/google/go-genproto/pull/149

In #149 we removed api-commons-protos from the generation script, since
it is not currently usable. This is the first PR to regenerate with that
change.

BREAKING_CHANGE_ACCEPTABLE=due to b/, annotations are not being synced
to googleapis. Consequentially, several annotation files have been
deleted and various fields/comments have been removed. This largely
shouldn't matter for us, since we're not using microgenerators yet
(which is the only thing that needs annotations).