PCP Updates: IPv6 for libpcp_pmda

[Dave Brolley <brolley@xxxxxxxxxx>]

The following has been pushed to the brolley/dev branch of the pcpfans 
repository. It adds IPv6 support to the pmdaConnect() API of libpcp_pmda.
Some guidance regarding which qa test(s) to augment would be 
appreciated. It's hard to tell by number :-(
Dave

commit 25dea424f627badb0f42d2a513235170c4c1ded5
Author: Dave Brolley <brolley@xxxxxxxxxx>
Date:   Tue May 21 11:24:06 2013 -0400

    IPv6 Support in libpcp_pmda.

    - Add a new pmdaIPv6 enumerator to pmdaIoType
    - Rename pmdaOpenInet() to pmdaOpenIP(). It now handles inet
      and IPv6 sockets.
    - Add new -6 option to pmdaGetOpt() to request an IPv6 connection.
    - Add set_ipv6_socket() to src/perl/PMDA/PMDA.xs and
      src/python/pcp/pmda.py
    - update the pmdaconnect.3 man page