Fixed a print.

tests/test_mediaworker.py

@@ -56,7 +56,7 @@ def run_tests(ip):
         print('%sAll tests completed on MediaWorker "%s".' % (GREEN, ip, DEF))
         return True
     else:
-        print('%apt-get update failed on MediaWorker "%s".%s' % (RED, ip, DEF))
+        print('%sapt-get update failed on MediaWorker "%s".%s' % (RED, ip, DEF))
         return False