Do not retry in resolution_fails() on timeout

Do not retry in resolution_fails() on timeout

At the time of test number (19), there were 10 "sending packet to
10.53.0.7" lines in the "legacy/ns1/named.run" file; usually, only seven
are present:

    I:legacy:checking recursive lookup to edns 512 + no tcp server does not cause query loops (19)
    I:legacy:ns1 sent 10 queries to ns7, expected less than 10
    I:legacy:failed

Those three can be attributed to tests "8", "10", and "18", where the
dig of "resolution_fails()" retried after a timeout to succeed with
"status: SERVFAIL" subsequently, as seen in each of
dig.out.test{8,10,18} files.

    ;; communications error to 10.53.0.1#13093: timed out

    ; <<>> DiG 9.19.12-dev <<>> -p 13093 +tcp @10.53.0.1 edns512-notcp. TXT
    ; (1 server found)
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 5368
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

This retry is unnecessary because "resolution_fails()" considers timeout
a positive result.