Sync parser tests from core

* Blacklisted a bunch of wt2html, html2wt and html2html failures.

* The wt2html failures require improving normalization code

* The html2wt and html2html failures are all syntactic diffs
  from newlines before/between/after lists because the PHP parser
  now emits newlines after <ul> and before </ul> which Parsoid
  than emits leading to dirty diffs.

* Rather than mess with separators and constraints to deal with this,
  for now, blacklisting this knowing that this is harmless since it
  doesn't affect wt2wt mode currently and doesn't affect new lists.

  But, once we make changes in Parsoid to deal with the problem
  outlined in bug 39617, we might have to tweak the serializer at that
  time as well.

Change-Id: I3a9d0000e29e58c2ff3f0f26a5358c91a7ae4b91
Merge "Sync parser tests from core"