net: support go resolver for LookupHost and LookupPort on plan9

[mateusz834]

All other lookup methods on plan 9 support the go resolver, I don't
see any reason for which the LookupHost shouldn't support it.

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Message from Mateusz Poliwczak:

Patch Set 1: Run-TryBot+1

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Patch Set 1:

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Patch Set 1:

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Patch Set 1: TryBot-Result-1

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Patch Set 2: Run-TryBot+1

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Patch Set 2:

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Patch Set 2: TryBot-Result+1

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Patch Set 3: Run-TryBot+1

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Patch Set 3:

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Patch Set 3:

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Patch Set 3: TryBot-Result-1

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Patch Set 4: Run-TryBot+1

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Patch Set 4:

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Patch Set 4: TryBot-Result-1

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Patch Set 4:

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Message from Mateusz Poliwczak:

Patch Set 5: Run-TryBot+1

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Patch Set 5:

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Patch Set 5:

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Message from Mateusz Poliwczak:

Patch Set 7:

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