Allow format 0000-0000-0000 in postgresql MAC parser

Hello,

Some devices send the MAC address in RADIUS requests in the format
0000-0000-0000. I've seen this with a 3com switch, but there may be
others. Currently, postgresql doesn't understand this format.

This patch adds an extra line to the macaddr parsing in postgres to
support this format as well. A unit test has been added.

Kind regards,

--
Herwin Weststrate
Quarantainenet BV
www.quarantainenet.nl