Removes mailing list third-party-request

Using the word -request in a mailing list name is a bad idea.
The mail server uses -request internally as a reserved word. This
patch removes the definition for the list with the name
third-party-request.

Change-Id: Id549f982c74407e3ea57ba5bfe1bf950774f14e3
Merge "Removes mailing list third-party-request"