Mark the vmservice tests as non-flaky

tests/standalone/standalone.status

Index: tests/standalone/standalone.status
diff --git a/tests/standalone/standalone.status b/tests/standalone/standalone.status
index 2079fd28eac5a41dbe7b060241cc30ce8f3202f0..b511d93c2f2b7f1197276c60f07849ebb94a30b7 100644
--- a/tests/standalone/standalone.status
+++ b/tests/standalone/standalone.status
@@ -11,16 +11,6 @@ package/invalid_uri_test: Fail, OK # Fails intentionally
 
 [ $runtime == vm ]
 package/package_isolate_test: Fail # http://dartbug.com/7520.
-vmservice/isolate_echo_test: Pass, Fail # Issue: 12294
-vmservice/isolate_list_test: Pass, Fail # Issue: 12294
-vmservice/isolate_stacktrace_command_test: Pass, Fail # Issue: 12294
-vmservice/unknown_isolate_command_test: Pass, Fail # Issue: 12294
-
-[ $runtime == vm && $system == windows ]
-vmservice/isolate_class_test: Pass, Fail # Issue: 12294
-vmservice/isolate_code_test: Pass, Fail # Issue: 12294
-vmservice/isolate_function_test: Pass, Fail # Issue: 12294
-vmservice/isolate_library_test: Pass, Fail # Issue: 12294
 
 [ $runtime == vm && $checked ]
 # These tests have type errors on purpose.
@@ -34,9 +24,6 @@ io/stdout_bad_argument_test: Fail, OK
 io/file_fuzz_test: Skip
 io/directory_fuzz_test: Skip
 
-[ $runtime == vm && $system == windows ]
-vmservice/multiple_isolate_list_test: Fail, Pass # http://dartbug.com/12124
-
 [ $runtime == vm && $system == macos ]
 # This test fails with "Too many open files" on the Mac OS buildbot.
 # This is expected as MacOS by default runs with a very low number