Remove unnecessary sleeps from tests

Removed unnecessary sleeps and replaced sleeps with wait_for_monitor in
some older tests. Also removed the odd arrangement of arrays in
server_weight.

maxscale-system-test/kill_master.cpp

@@ -32,7 +32,7 @@ int main(int argc, char* argv[])
     Test->repl->unblock_node(0);
 
     Test->stop_timeout();
-    sleep(10);
+    Test->maxscales->wait_for_monitor();
 
     Test->set_timeout(30);
     Test->tprintf("Reconnecting and trying query to RWSplit\n");