XML: upgrade-2.10.xsl: apply on pacemaker-1.x pengine CTS test cases...

...transitively, using upgrade-1.3.xsl as a (logical) midstep.
See comment at previous "pacemaker-2.x tests update" commit.

Also, we keep applying cts-pengine-autofix.py for where the digest
changed + single summary was edited manually, though it might be
worthwhile implementing such autofixer as well (migrate-fencing.exp).

[expected-quorum-votes=3075660066 FTW!]