c-ares / c-ares / #47

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ares_getaddrinfo(): Fail faster on AF_UNSPEC if we've already received one address class  (#551)

As per #541, when using AF_UNSPEC with ares_getaddrinfo() (and in turn with ares_gethostbynam()) if we receive a successful response for one address class, we should not allow the other address class to continue on with retries, just return the address class we have.

This will limit the overall query time to whatever timeout remains for the pending query for the other address class, it will not, however, terminate the other query as it may still prove to be successful (possibly coming in less than a millisecond later) and we'd want that result still. It just turns off additional error processing to get the result back quicker.

Fixes Bug: #541
Fix By: Brad House (@bradh352)

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