DoT quick fallback
If a DNS query that was sent to a DoT server times out, instead of trying the next DoT server, let the query fall back to UDP. This will be helpful when firewall blocks TCP/853 traffic, for example captive portal re-login. DoT quick fallback is enabled by default. It's configurable by the flag `dot_quick_fallback`. Bug: 228594312 Test: cd packages/modules/DnsResolver && atest Test: On a wifi network with 2 validated DoT servers, blocked TCP/853 traffic. DNS queries took 1x time w/ the flag enabled, and took 2x time w/o the flag enabled. Change-Id: I27992baf4dd450391ab6241a5bf46b71ae656766
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