Updated wikitext-escaping tests to reflect Parsoid's latest output

* Changed wikitext (input) portion of several html2wt-centric tests
  to match how Parsoid adds the nowiki tags. We are not as concerned
  about the wt -> html direction.

* Changed 'disabled' flag to 'parsoid' on several tests since that was
  the original intention of these disabled tests.  Since then, we have
  the parsoid option to indicate the same thing which is more accurate
  than 'disabled'.

* Added few more escaping tests based on recent Parsoid fixes and
  discovery of new bugs.

* Disabled one test known to not pass because of absence of
  data-parsoid flags.

Change-Id: Icd10a9bccbcc27715914b9f00a20afb06ed275d1