tools: ynl: convert rt-route sample to selftest

Convert rt-route.c to use kselftest_harness.h with FIXTURE/TEST_F.
This is the last test to convert so clean up the Makefile.

Validate that the conne

tools: ynl: convert rt-route sample to selftest

Convert rt-route.c to use kselftest_harness.h with FIXTURE/TEST_F.
This is the last test to convert so clean up the Makefile.

Validate that the connected routes for 192.168.1.0/24 and
2001:db8::/64 appear in the dump.

Output:

TAP version 13
1..1
# Starting 1 tests from 1 test cases.
# RUN rt_route.dump ...
# oif: nsim0 dst: 192.168.1.0/24
# oif: lo dst: ::1/128
# oif: nsim0 dst: 2001:db8::1/128
# oif: nsim0 dst: 2001:db8::/64
# oif: nsim0 dst: fe80::/64
# oif: nsim0 dst: ff00::/8
# OK rt_route.dump
ok 1 rt_route.dump
# PASSED: 1 / 1 tests passed.
# Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0

Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Tested-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20260307033630.1396085-11-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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