Merge pull request #180 from OPpuolitaival/py3_fixes

Fix json export to work with python 3

Author: Olli-Pekka Puolitaival

packages/mbed-greentea/mbed_greentea/mbed_greentea_cli.py

@@ -928,7 +928,6 @@ def get_parallel_value(value):
         execute_threads = []
 
         if opts.verbose_test_configuration_only:
-            print
             print("Example: execute 'mbedgt --target=TARGET_NAME' to start testing for TARGET_NAME target")
             return (0)
 

src/mbed_os_tools/test/mbed_test_api.py

@@ -395,7 +395,7 @@ def get_memory_metrics(output):
                 thread_arg = thread_entry_arg_split[1]
                 thread_info[thread_entry_arg]['arg'] = thread_arg
 
-    thread_info_list = thread_info.values()
+    thread_info_list = list(thread_info.values())
 
     return max_heap_usage, reserved_heap, thread_info_list