plugins: net/frr7 - completely broken in 20.7

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Describe the bug FRR communication between Zebra (route export/import) and all daemons is broken in 20.7, which means that routing does not work correctly, period. This can be reproduced by any configuration and protocol because it is a failure to communicate with Zebra.

Indicator:

zebra/zebra_ptm.c:1362 failed to find process pid registration
BGP: [EC 33554499] sendmsg_nexthop: zclient_send_message() failed

If that appears in the logs, routes are not going to be updated correctly. It will appear in the logs every time. See https://github.com/FRRouting/frr/issues/3136 for a better explanation and details. This matches exactly.

To Reproduce

• Set up any sort of FRR configuration (OSPF, OSPFv3, BGP)
• Enable FRR
• Observe zebra/zebra_ptm.c:1362 failed to find process pid registration in logs

Expected behavior See https://github.com/FRRouting/frr/issues/3136

Relevant log files

2020/08/01 12:28:52 ZEBRA: zebra/zebra_ptm.c:1351 failed to find process pid registration
2020/08/01 12:28:52 ZEBRA: client 20 disconnected 0 bgp routes removed from the rib
2020/08/01 12:28:53 ZEBRA: Terminating on signal
2020/08/01 12:28:53 BGP: [EC 33554499] sendmsg_nexthop: zclient_send_message() failed

Additional context Add any other context about the problem here.

Environment OPNsense 20.7 frr7 7.4_1