bgpd: initial batch of evpn lttng tracepoints

Low overhead bgp-evpn TPs have been added which push data out in a binary
format -
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root@switch:~# lttng list --userspace |grep "frr_bgp:evpn"
      frr_bgp:evpn_mh_nh_rmac_zsend (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)
      frr_bgp:evpn_mh_nh_zsend (loglevel: TRACE_INFO (6)) (type: tracepoint)
      frr_bgp:evpn_mh_nhg_zsend (loglevel: TRACE_INFO (6)) (type: tracepoint)
      frr_bgp:evpn_mh_vtep_zsend (loglevel: TRACE_INFO (6)) (type: tracepoint)
      frr_bgp:evpn_bum_vtep_zsend (loglevel: TRACE_INFO (6)) (type: tracepoint)
      frr_bgp:evpn_mac_ip_zsend (loglevel: TRACE_INFO (6)) (type: tracepoint)
root@switch:~#
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In addition to the tracepoints a babeltrace python plugin for pretty
printing (binary data is converted into grepable strings). Sample usage -
frr_babeltrace.py trace_path

Sample tracepoint output -
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1. frr_bgp: evpn_mac_ip_zsend
frr_bgp:evpn_mac_ip_zsend {'action': 'add', 'vni': 1007, 'mac': '00:02:00:00:00:04', 'ip': 'fe80::202:ff:fe00:4', 'vtep': '27.0.0.15', 'esi': '03:44:38:39:ff:ff:01:00:00:02'}

2. frr_bgp: evpn_mh_vtep_zsend
frr_bgp:evpn_mh_vtep_zsend {'action': 'add', 'esi': '03:44:38:39:ff:ff:01:00:00:02', 'vtep': '27.0.0.16'}

3. frr_bgp: evpn_mh_nhg_zsend
frr_bgp:evpn_mh_nhg_zsend {'action': 'add', 'type': 'v4', 'nhg': 74999998, 'esi': '03:44:38:39:ff:ff:01:00:00:02', 'vrf': 85}

4. frr_bgp: evpn_mh_nh_zsend
frr_bgp:evpn_mh_nh_zsend {'nhg': 74999998, 'vtep': '27.0.0.16', 'svi': 93}

5. frr_bgp: evpn_mh_nh_rmac_zsend
frr_bgp:evpn_mh_nh_rmac_zsend {'action': 'add', 'vrf': 85, 'nh': '::ffff:1b00:12', 'rmac': '00:02:00:00:00:50'}
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Signed-off-by: Anuradha Karuppiah <anuradhak@nvidia.com>

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