Just out of the blue wicked removes the configured DHCPv6 lease address from
the interface, breaking IPv6 networking.

2015-03-05T11:49:45.800560+01:00 hawking wickedd-dhcp6[1279]: br0: Request to
acquire DHCPv6 lease with UUID c434f854-3da9-0b00-0f05-000006000000 in mode
auto
2015-03-05T11:49:48.730735+01:00 hawking wickedd-dhcp6[1279]: br0: Committed
DHCPv6 lease with addresses:
2015-03-05T11:49:48.755173+01:00 hawking wickedd-dhcp6[1279]:    
2620:113:80c0:8080:10:160:4:0, pref-lft 10800, valid-lft 10800
2015-03-05T11:49:52.073757+01:00 hawking avahi-daemon[1245]: Registering new
address record for 2620:113:80c0:8080:10:160:4:0 on br0.*.
2015-03-05T12:49:48.818752+01:00 hawking wickedd-dhcp6[1279]: br0: Committed
DHCPv6 lease with addresses:
2015-03-05T12:49:48.819631+01:00 hawking wickedd-dhcp6[1279]:    
2620:113:80c0:8080:10:160:4:0, pref-lft 10800, valid-lft 10800
2015-03-05T12:49:48.820033+01:00 hawking wickedd[1295]: br0: address
2620:113:80c0:8080:10:160:4:0 covered by a dhcp lease
2015-03-05T13:49:48.823644+01:00 hawking wickedd-dhcp6[1279]: br0: Committed
DHCPv6 lease with addresses:
2015-03-05T13:49:48.825397+01:00 hawking wickedd-dhcp6[1279]:    
2620:113:80c0:8080:10:160:4:0, pref-lft 10800, valid-lft 10800
2015-03-05T13:49:48.825960+01:00 hawking wickedd[1295]: br0: address
2620:113:80c0:8080:10:160:4:0 covered by a dhcp lease
2015-03-05T14:49:48.830804+01:00 hawking wickedd-dhcp6[1279]: br0: Committed
DHCPv6 lease with addresses:
2015-03-05T14:49:48.831604+01:00 hawking wickedd-dhcp6[1279]:    
2620:113:80c0:8080:10:160:4:0, pref-lft 10800, valid-lft 10800
2015-03-05T14:49:48.832215+01:00 hawking wickedd[1295]: br0: address
2620:113:80c0:8080:10:160:4:0 covered by a dhcp lease
2015-03-05T14:49:48.854479+01:00 hawking avahi-daemon[1245]: Withdrawing
address record for 2620:113:80c0:8080:10:160:4:0 on br0.