Fix loguserdata output to file issue

Fixes bug #1191685

Change-Id: I2a02b490e45c3cb838243b9dad62cc52b609b336

heat/cloudinit/loguserdata.py

@@ -35,14 +35,15 @@ def call(args):
         def write(self, data):
             LOG.info(data)
 
-        def __getattr__(self, attr):
-            return getattr(sys.stdout, attr)
-
     LOG.info('%s\n' % ' '.join(args))
     try:
         ls = LogStream()
-        p = subprocess.Popen(args, stdout=ls, stderr=ls)
-        p.wait()
+        p = subprocess.Popen(args, stdout=subprocess.PIPE,
+                             stderr=subprocess.PIPE)
+        data = p.communicate()
+        if data:
+            for x in data:
+                ls.write(x)
     except OSError as ex:
         if ex.errno == errno.ENOEXEC:
             LOG.error('Userdata empty or not executable: %s\n' % str(ex))

heat/tests/test_loguserdata.py

@@ -34,6 +34,9 @@ class FakePOpen():
     def wait(self):
         pass
 
+    def communicate(self, input=None):
+        pass
+
 
 class LoguserdataTest(HeatTestCase):