Update libnet to CPAN version 3.03

  [DELTA]

3.03 2014-11-28

    - Remodelled SSL support in Net::NNTP in the manner of Net::POP3 and
      Net::SMTP.  [Steffen Ullrich, PR#9]

    - Increased minimum requred IO::Socket::SSL version from 1.999 to 2.007 to
      fix data connection problems in Net::FTP.  [Steffen Ullrich, CPAN
      RT#100529]

    - Fixed a broken port() call in pasv_xfer()/pasv_xfer_unique() in Net::FTP.
      [Mario Preksavec, PR#8]

    - Increased minimum required Socket version from 1.3 to 2.016.  This may be
      required when those modules that can support IPv6 load IO::Socket::IP (on
      some OSes, at least).  It does not appear to be necessary if they load
      IO::Socket::INET6 or IO::Socket::INET instead, but this is not easy for
      the end-user to control so it is simpler to always insist on Socket 2.016
      or higher.  [CPAN RT#100020]

    - Fixed "Argument ... isn't numeric in subroutine entry" warnings when using
      older versions of Perl.  [CPAN RT#100020]

    - Added optional Changes testing (skipped unless AUTHOR_TESTING).

    - Reformatted Changes file as per CPAN::Changes::Spec.