CC-4970: Process return codes aren't "reaped" after exiting - Zombie processes are created.

-fixed

python_apps/media-monitor2/media/metadata/process.py

@@ -174,7 +174,8 @@ def normalize_mutagen(path):
     try:
         command = ['silan', '-f', 'JSON', md['path']]
         proc = subprocess.Popen(command, stdout=subprocess.PIPE)
-        out = proc.stdout.read()
+        out = proc.communicate()[0].strip('\r\n')
+
         info = json.loads(out)
         md['cuein'] = info['sound'][0][0]
         md['cueout'] = info['sound'][-1][1]