Deleted routes hide visible routes

[magiconair]

All versions of fabio have the following bug:

If you delete all routes of a service with the route del service manual override then paths registered by this service are still considered for routing.

Given this routing table

route add serviceA /foo http://127.0.0.1:5000/
route add serviceB /foo/bar http://127.0.0.1:5001/
route del serviceB

the log will print the correct routing table

route add serviceA /foo http://127.0.0.1:5000/

but internally there is still a route for /foo/bar with no targets which is evaluated during lookup. Therefore, a request for /foo/bar will not be routed to serviceA but to nowhere since the dangling route has no targets.

The current workaround is to add a manual override for the specific route to serviceA, e.g.

route add serviceA /foo/bar http://127.0.0.1:5000/

[magiconair]

Thanks for @ilya-pi for finding it.

[magiconair]

Hmm, the fix for this bug fundamentally conflicts with issue #52 since there the deleted routes are only marked but not removed. I may have to rethink that

[magiconair]

I'll roll this fix first and then refactor for issue #52.