DHCP client option 61 "client_id"

the existing seeting of client_id to a VPP version number was unused and so overridden

Change-Id: If9ebea936336f1fcca8d07e67186c95f8f8f0ccd
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/test/vpp_papi_provider.py b/test/vpp_papi_provider.py
index 31eadad..2814ef9 100644
--- a/test/vpp_papi_provider.py
+++ b/test/vpp_papi_provider.py
@@ -1758,6 +1758,7 @@
     def dhcp_client(self,
                     sw_if_index,
                     hostname,
+                    client_id='',
                     is_add=1,
                     want_dhcp_events=0):
         return self.api(
@@ -1765,6 +1766,7 @@
             {
                 'sw_if_index': sw_if_index,
                 'hostname': hostname,
+                'client_id': client_id,
                 'is_add': is_add,
                 'want_dhcp_event': want_dhcp_events,
                 'pid': os.getpid(),