Bug 55418: Add job runners for new Parsoid job types

Parsoid jobs are now split in two queues:

1) Re-parses of an edited page itself

2) Updates to pages transcluding a page (or template) or an image

The second has a lower priority and is more expensive, while the first is
important for avoiding cache misses in the Parsoid Varnishes.

Change-Id: I60d2d179c3d5805b8b5d6e45a4f14904bf1bebdb
Merge "Bug 55418: Add job runners for new Parsoid job types" into production