If the actual DNS lookup in LookupIPAddr completes quickly enough,
it may succeed even if the passed-in Context is already canceled.
That would (rarely) cause TestLookupContextCancel to fail due to an
unexpectedly-nil error.
This change uses the existing testHookLookupIP hook to delay the
cancellation until the lookup has started (to try to provoke the code
path for which the test was added), and then block the lookup result
until LookupIPAddr has noticed it.