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Let InterwikiTablePrefixLookup reject ambiguous hosts

Authored by thiemowmde on Jun 20 2018, 12:18 PM.

Description

Let InterwikiTablePrefixLookup reject ambiguous hosts

This is a safe-guard for situations where multiple different entries in
the interwiki table point to the same host, but to different paths. We
actually have this in our production interwiki tables.

Trivial aliases are fine.

Bug: T196976
Change-Id: Ie76f62d6f6dedd6c63314fd780936d0a3e80b390

Details