Wait for free port in legal range.

This issue happens often when I ran the tests locally on my MacOS machine.

Author: nihohit

redis/tests/support/mod.rs

@@ -383,7 +383,7 @@ impl RedisServer {
 /// process, so this must be used with care (since here we only use it for tests, it's
 /// mostly okay).
 pub fn get_random_available_port() -> u16 {
-    for _ in 0..100 {
+    for _ in 0..10000 {
         let addr = &"127.0.0.1:0".parse::<SocketAddr>().unwrap().into();
         let socket = Socket::new(Domain::IPV4, Type::STREAM, None).unwrap();
         socket.set_reuse_address(true).unwrap();