Log Message:
p5-Net-DNS: update to 1.17.

**** 1.17 Jul 25, 2018

Fix rt.cpan.org #125890

	AXFR: 1 record per packet responses.

Fix rt.cpan.org #125889

	New NSEC3 for empty non-terminal leaves type bitmap undefined.

Fix rt.cpan.org #125882

	RDATA name compression pointer calculated incorrectly.

**** 1.16 Jul 15, 2018

Feature
	New NSEC3 encloser(), nextcloser() and wildcard() instance
	methods return closest encloser, "next closer" and putative
	wildcard names respectively.

Feature
	Add new NSEC covers() instance method.

Feature
	New NSEC typemap() instance method interrogates type list.

	IO::Socket::INET6 removed from recommended module metadata.
	IPv6 requires IO::Socket::IP which is now a core package.

	No requirement to escape @ in unquoted contiguous string.