FRR Release 8.4.7

FRR Release 8.4.7

- bgpd
-   Add `bgp ipv6-auto-ra` command
-   Include structure when removing End.DT4/6 SID
-   Include structure when installing End.DT4/6 SID
- lib
-   Include SID structure in seg6local nexthop
- ospfd
-   Fix heap corruption vulnerability when parsing SR-Algorithm TLV
- zebra
-   Fix crash during reconnect
-   Add missing proto translations
-   Correctly report metrics
-   Let's use memset instead of walking bytes and setting to 0
-   Fix snmp walk of zebra rib

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>