controls whether BGP messages that are exchanged on this
connection are dumped to the log.
BGP_DBG_MSG_DUMP_REC_OPEN enables tracing of OPEN messages
BGP_DBG_MSG_DUMP_REC_UPDATE - UPDATE messages
BGP_DBG_MSG_DUMP_REC_NOTIFICATION - NOTIFICATION and
BGP_DBG_MSG_DUMP_REC_KEEPALIVE - KEEPALIVE
on logical OR basis
BGP_DBG_MSG_DUMP_DISABLED 1
BGP_DBG_MSG_DUMP_REC_OPEN 0x10 - 16
BGP_DBG_MSG_DUMP_REC_UPDATE 0x20 - 32
BGP_DBG_MSG_DUMP_REC_NOTIFICATION 0x40 - 64
BGP_DBG_MSG_DUMP_REC_KEEPALIVE 0x80 - 128