This is what (most) callers actually want, so unify it into one place. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Equivalent to gossipd/test/run-find_route.c and gossipd/test/run-find_route-specific.c except they use gossmap. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>