Github user jacksontj commented on the pull request:
https://github.com/apache/trafficserver/pull/536#issuecomment-219065574
This patch will actually be a no-op. MultiCache is harcoded ALL over to
only accept 3 levels. I looked through the code and it seems that this is
actually the only instance where we are not using `hostdb.levels` (e.g.
https://github.com/apache/trafficserver/blob/master/iocore/hostdb/HostDB.cc#L666).
So, we can merge this (to make it all consistent), but it should be a no-op.
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