Automation fix for VMI menu

Changes:
    - Modified Testcase
      "Configure IPv6 Static Default Gateway On VMI And Verify"
    - Modified keyword
      "Set Static VMI IPv6 Address"

Tested: - test_vmi.robot
    - ../../lib/external_intf/vmi_utils.robot
Change-Id: I671f729bcbb2fe3deee2a39dfbb2cc224ab67e02
Signed-off-by: Megha G N <Megha.G.N@ibm.com>
diff --git a/lib/external_intf/vmi_utils.robot b/lib/external_intf/vmi_utils.robot
index 6a441d5..21b7c22 100644
--- a/lib/external_intf/vmi_utils.robot
+++ b/lib/external_intf/vmi_utils.robot
@@ -312,6 +312,7 @@
     Redfish.patch  /redfish/v1/Systems/hypervisor/EthernetInterfaces/${interface}
     ...  body=&{data}  valid_status_codes=[${valid_status_codes}]
 
+    Sleep  5s
 
 Set VMI IPv6 Static Default Gateway
     [Documentation]  Set VMI IPv6 static default gateway address.