add print for chassis

scripts/portstat

@@ -17,6 +17,7 @@ from collections import OrderedDict, namedtuple
 from natsort import natsorted
 from tabulate import tabulate
 from sonic_py_common import multi_asic
+from sonic_py_common import device_info
 
 # mock the redis for unit test purposes #
 try:
@@ -337,7 +338,7 @@ class Portstat(object):
             print(table_as_json(table, header))
         else:
             print(tabulate(table, header, tablefmt='simple', stralign='right'))
-            if multi_asic.is_multi_asic():
+            if multi_asic.is_multi_asic() or device_info.is_chassis():
                 print("\nReminder: Please execute 'show interface counters -d all' to include internal links\n")
 
     def cnstat_intf_diff_print(self, cnstat_new_dict, cnstat_old_dict, intf_list):
@@ -555,7 +556,7 @@ class Portstat(object):
             print(table_as_json(table, header))
         else:
             print(tabulate(table, header, tablefmt='simple', stralign='right'))
-            if multi_asic.is_multi_asic():
+            if multi_asic.is_multi_asic() or device_info.is_chassis():
                 print("\nReminder: Please execute 'show interface counters -d all' to include internal links\n")
 
 def main():