test: retry on smartos if ECONNREFUSED

SmartOS has a bug that causes unexpected ECONNREFUSED errors.

See https://smartos.org/bugview/OS-2767

If ECONNREFUSED on SmartOS, retry the test one time.

Fixes: nodejs#3864
Fixes: nodejs#2815
PR-URL: nodejs#3941

tools/test.py

@@ -138,6 +138,13 @@ def RunSingle(self, parallel, thread_id):
       try:
         start = datetime.now()
         output = case.Run()
+        # SmartOS has a bug that causes unexpected ECONNREFUSED errors.
+        # See https://smartos.org/bugview/OS-2767
+        # If ECONNREFUSED on SmartOS, retry the test one time.
+        if (output.UnexpectedOutput() and
+          sys.platform == 'sunos5' and 
+          'ECONNREFUSED' in output.output.stderr):
+            output = case.Run()
         case.duration = (datetime.now() - start)
       except IOError, e:
         return