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Lookup a name using multiple resolvers.
Future Plans: This needs someway to specify which resolver answered
the query, or someway to specify (authority|ttl|cache behavior|more?)
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Lookup an address using multiple L{IResolver}s
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@type resolvers: L{list}
@param resolvers: A L{list} of L{IResolver} providers.
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Build a L{dns.Query} for the given parameters and dispatch it
to each L{IResolver} in C{self.resolvers} until an answer or
L{error.AuthoritativeDomainError} is returned.
@type name: C{str}
@param name: DNS name to resolve.
@type type: C{int}
@param type: DNS record type.
@type cls: C{int}
@param cls: DNS record class.
@type timeout: Sequence of C{int}
@param timeout: Number of seconds after which to reissue the query.
When the last timeout expires, the query is considered failed.
@rtype: L{Deferred}
@return: A L{Deferred} which fires with a three-tuple of lists of
L{twisted.names.dns.RRHeader} instances. The first element of the
tuple gives answers. The second element of the tuple gives
authorities. The third element of the tuple gives additional
information. The L{Deferred} may instead fail with one of the
exceptions defined in L{twisted.names.error} or with
C{NotImplementedError}.
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