Fix *another* bug in the parsoid-regressions job... then turn it off.

We don't really use this job anyway: we have our own blacklist used to
protect against regressions.  So patch the job to fix it... but then
turn it off, to be *sure* that we won't be getting these spurious
failures any more.

Change-Id: Id85596a043f89d60ea670db4a36eec559c29d55c
New Parsoid test: run parsoid's parserTests file using PHP parser.

This helps ensure that we don't commit tests to our fork of
parserTests.txt that will break when we try to merge them with core.

Change-Id: I49d3551676893bfdf7fdf408e90d7477a33608a7