Aborts on single resolver timeout

[frh]

When it's querying the nameservers to see if the record has propagated (loops that start at L293 and L387), the entire script aborts if an exception occurs in verify_record. The secondary nameservers I use will usually timeout at least once before the record has propagated, possibly as a result of rate limiting from querying them once a second. I worked around this by commenting out L305-307 and L399-402 so it keeps going until the wait timer has been reached.