Renumber 2PC resource managers so that compared to 9.0, predicate lock rmgr

Renumber 2PC resource managers so that compared to 9.0, predicate lock rmgr
is added to the end, and existing resource managers keep their old ids.
We're not going to guarantee on-disk compatibility for 2PC state files over
major releases, but it seems better to avoid changing the ids them anyway.
It will help anyone who might want to write external tools to inspect the
state files to work with files from different versions, if nothing else.
Per complaint from Tom Lane.