test: Add an HS v3 reachability unit test

This is a large and important unit test for the hidden service version
3! It tests the service reachability for a client using different
consensus timings and makes sure that the computed hashring is the same
on both side so it is actually reachable.

Signed-off-by: David Goulet <dgoulet@torproject.org>

scripts/maint/checkSpace.pl

@@ -140,7 +140,7 @@ for my $fn (@ARGV) {
                     $1 ne "switch" and $1 ne "return" and $1 ne "int" and
                     $1 ne "elsif" and $1 ne "WINAPI" and $2 ne "WINAPI" and
                     $1 ne "void" and $1 ne "__attribute__" and $1 ne "op" and
-                    $1 ne "size_t" and $1 ne "double" and
+                    $1 ne "size_t" and $1 ne "double" and $1 ne "uint64_t" and
                     $1 ne "workqueue_reply_t") {
                     msg "     fn ():$fn:$.\n";
                 }