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Disable rebound CDN purges for backlinks in HTMLCacheUpdateJob

Authored by aaron on Aug 24 2017, 10:10 PM.

Description

Disable rebound CDN purges for backlinks in HTMLCacheUpdateJob

These are there to handle regeneration race conditions due to
replication lag. If there happens to already be a huge amount
of purges, the cost of this can be too high. Also, if the queue
is backlogged, then it is already delayed, so extra delayed jobs
do not help and just add to the backlog in that scenario.

Bug: T173710
Change-Id: Ida0bf44233072e1356a9fe63866d522e4bb2d0ca