Log Message:
Update ipaddr to version 2.1.7. While here, fix pkgsrc test target.

Major changes:

== 2.1.7 == (2011-01-13)

  * turn teredo and sixtofour into properties as opposed to normal methods.

== 2.1.6 == (2011-01-13)

  * typo fixes.
  * fix for ipaddr_test referring to an old version of ipaddr.
  * add test cases for r176 and r196.
  * fix for recognizing IPv6 addresses with embedded IPv4 address not
    being recognized.
  * additional unit tests for network comparisons and sorting.
  * force hash() to long to ensure consistency
  * turn v4_int_to_packed and v6_int_to_packed into public functions
    to aid converting between integers and network objects.
  * add support for pulling teredo and 6to4 embedded addresses out
    of an IPv6 address.