Add HTTPS 204 response code for the PATCH request

Changes:
    - Add HTTP_NO_CONTENT as a valid response code
      for PATCH request for the ethernet interface
      Example:
      /redfish/v1/Managers/bmc/EthernetInterfaces/eth0
      /redfish/v1/Managers/bmc/EthernetInterfaces/eth1

Tested:
    - NA

Change-Id: I95f21e3b5e438d4134324b0cdf95342b6a97ebd4
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/redfish/managers/test_multiple_interfaces_dhcp.robot b/redfish/managers/test_multiple_interfaces_dhcp.robot
index b617405..632291b 100644
--- a/redfish/managers/test_multiple_interfaces_dhcp.robot
+++ b/redfish/managers/test_multiple_interfaces_dhcp.robot
@@ -149,7 +149,7 @@
 Set DHCPEnabled To Enable Or Disable
     [Documentation]  Enable or Disable DHCP on the interface.
     [Arguments]  ${dhcp_enabled}=${False}  ${interface}=${ethernet_interface}
-    ...          ${valid_status_code}=[${HTTP_OK},${HTTP_ACCEPTED}]
+    ...          ${valid_status_code}=[${HTTP_OK},${HTTP_ACCEPTED},${HTTP_NO_CONTENT}]
 
     # Description of argument(s):
     # dhcp_enabled        False for disabling DHCP and True for Enabling DHCP.