Merge branch 'attr-errors'

Contains BGP fixes:

- set extcommunity crash: tihs patch tries to make the refcounting more robust
  but does not fully solve the problem, sadly.
- BGP attribute error handling: Little testing.

diff --cc bgpd/bgp_attr.c
Simple merge

diff --cc bgpd/bgp_packet.c
Simple merge

diff --cc bgpd/bgp_route.c
Simple merge

diff --cc bgpd/bgp_routemap.c
Simple merge