2021-08-20: rewritten for CMK 2.0 by thl-cmk[at]outlook[dot]com
            based on the "BGP Peer State Check" check by Thomas Wollner (tw[at]ollner-net[dot]de), 
            (http://wollner-net.de/check_mk/network_checks/bgp_peer-1.4.mkp)
2021-08-21: added more perfdata, added metrics file
2021-08-22: added WATO options, streamlined with cisco_bgp_peer