* sshfp records from nonstandard ports
If port 22 is not open, dns_update.py will not create SSHFP records
because it only scans port 22 for keys. This commit modifies
dns_update.py to parse the sshd_config file for open ports, and
then obtains keys from one of them (even if port 22 is not open).
* modified test of s per JoshData request
* edit CHANGELOG per JoshData
* fix typo