Sync parserTests with core.

This matches upstream core commit 480546006c1486edf763f600242868787a6af1da.

Upstream added a new gallery test, which parsoid doesn't support yet.
It also un-disabled the test for the {{msgnw}} keyword.

Change-Id: Iea0ad91d9f3c12de0ab35f50616b109ce05a41f7