Use the same IP address for both server and client in web_socket_pipe_test

tests/standalone/standalone.status

Index: tests/standalone/standalone.status
diff --git a/tests/standalone/standalone.status b/tests/standalone/standalone.status
index 2c1a7da7639925c88a75a3c5bbec59e03dcf0c9e..7251e17b831d12e3ecb041ba0fed00ab72b4a94f 100644
--- a/tests/standalone/standalone.status
+++ b/tests/standalone/standalone.status
@@ -35,7 +35,6 @@ io/directory_fuzz_test: Skip
 # This is expected as MacOS by default runs with a very low number
 # of allowed open files ('ulimit -n' says something like 256).
 io/socket_many_connections_test: Skip
-io/web_socket_pipe_test: Skip # Issue 12974
 
 # These tests pass on MacOS 10.8.2 but fails on the buildbot machines
 # that are running an earlier version of MacOS. The issue is that the
@@ -49,7 +48,6 @@ io/directory_non_ascii_test: Pass, Fail
 io/process_non_ascii_test: Pass, Fail
 
 [ $runtime == vm && $system == windows ]
-io/web_socket_pipe_test: Skip # Issue 12974
 io/http_server_early_client_close_test: Crash, Pass # Issue 12982
 
 [ $compiler == none && $runtime == drt ]