selftests: net: verify RTA_DEL_REASON on route deletion

Extend rtnetlink.py to check the reason reported in RTM_DELROUTE:

- expired: route with a 2s lifetime collected by the fib6 GC
  (gc_interval lowered like fib_tests.sh fib6_gc_test does);
- ra-withdrawn: a single RA advertises a default route (router
  lifetime), an on-link prefix route (RFC 4861 prefix information
  option) and a route information option route (RFC 4191), then a
  second RA withdraws all three with zero lifetimes; the RAs are
  crafted over a raw ICMPv6 socket so the test does not depend on an
  external RA tool;
- absence: a userspace deletion request records no cause and must not
  carry the attribute at all.

Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
Link: https://patch.msgid.link/20260808005642.26901-11-sigefriedhyy@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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