The GoDaddy API now strictly requires any array when
adding a single TXT record.

Inadvertently duplicated seconds & truncated fraction.

rdbath suggested how to implement a timeout on s_client probes.
Unfortunately, wait -n is a bash 4.3 feature.  So this requires
bash 4.3.  CHECK_CERT_TIMEOUT can be used to override the default, which
is 4 seconds.  Fallback is provided for older versions.

Views may require the 'nslookup' process to do somthing special, usually
provide a TSIG key or bind to a specific local address.  Add a
hook for that - export the VARIABLE DNS_CHECK_FUNC_OPTIONS with the
desired options._Set DNS_CHECK_FUNC to the desired command, which
must be one of the supported ones: 'dig', 'drill', 'host' or 'nslookup'.


However, this turned up the fact that the dig/drill code had the domain
and record type arguments in the wrong order on the command line.
(The domain comes first, see the man page.)  Fixed.

In some cases defining the previously undocumented PUBLIC_DNS_SERVER
may work.  This commit adds it to the template file, and exports it
for the benefit of DNS_UPDATE scripts.  Also AUTH_DNS_SERVER.

Squashed awk complaints about curl.header in some cases with debugging on.

Support older curl (--trace-time is somewhat recent)

-t FILE (or GODADDY_TFILE=FILE) will append command arguments
and all wire traffic to a file.

This provides all the information needed for debugging future issues.

Prevents GoDaddy secret and key from exposure via ps.

There is still an issue if environment variables can be read.

Uses the GoDaddy "Developer" API to add and remove the ACME challenge
records.