2020-06-22: initial release
2020-07-20: added BGP prefix counter
2022-04-18: merged with bkp_peer (neds at least version 20220418.v1.7)
2022-04-30: code cleanup
2022-05-09: added item to BgpPeer class, this is used in the discovery function
2022-05-11: changed bgp_get_peer_entry to get proper parameters instead of Nontransparent list
            added remote_as to BgpPeerItem
2022-05-12: changed IPv6 address format to lower case as required by rfc5952 section-4.3 (this affects IPv6 peers)
2023-02-18: moved metrics file from ~/local/share/check_mk/... to ~/local/lib/check_mk/...