Update test_l3_powersave_traffic.py

added absolute path to line  10- entire file is a WIP

py-scripts/test_l3_powersave_traffic.py

@@ -7,9 +7,8 @@ if sys.version_info[0] != 3:
     print("This script requires Python 3")
     exit(1)
 
-
 if 'py-json' not in sys.path:
-    sys.path.append('../py-json')
+    sys.path.append(os.path.join(os.path.abspath('..'),'py-json'))
 
 import argparse
 from LANforge.lfcli_base import LFCliBase