When calling dns_resolver_createfetch in resolver.c with a callback
of resume_dslookup, clear DNS_FETCHOPT_TRYSTALE_ONTIMEOUT from
options as DNS_EVENT_TRYSTALE is not an expected event type and
triggers a REQUIRE.
(cherry picked from commit 6faea6da3d646557d234d63ddd5d524d222e8082)
Mark AndrewsandNicki Křížek
b36e1cfbcd