Added test verify persistency of DHCPv6 on reboot on eth1

Changes:
    - Added the test case:
    Verify Persistency Of DHCPv6 On Reboot On Eth1

    Tested:
        Ran and Tested on BMC Environment.
Change-Id: I936ef328c29fa4ce2d32e67d07eb2d1503cef164
Signed-off-by: Abhijith Naik <Abhijith.Naik@ibm.com>
diff --git a/redfish/managers/test_bmc_ipv6.robot b/redfish/managers/test_bmc_ipv6.robot
index c11ae2b..1cdc11e 100644
--- a/redfish/managers/test_bmc_ipv6.robot
+++ b/redfish/managers/test_bmc_ipv6.robot
@@ -183,6 +183,21 @@
     Verify DHCPv6 Property          Enabled
 
 
+Verify Persistency Of DHCPv6 On BMC Reboot On Eth1
+    [Documentation]  Verify persistency of DHCPv6 property and
+    ...    all existing n/w configurations on BMC reboot on eth1.
+    [Tags]  Verify_Persistency_Of_DHCPv6_On_BMC_Reboot_On_Eth1
+    [Setup]  Set And Verify DHCPv6 Property  Enabled  ${2}
+
+    Redfish OBMC Reboot (off)  stack_mode=skip
+
+    Verify DHCPv6 Property  Enabled  ${2}
+
+    Verify All The Addresses Are Intact  ${1}
+    Verify All The Addresses Are Intact  ${2}
+    ...    ${eth1_initial_ipv4_addressorigin_list}  ${eth1_initial_ipv4_addr_list}
+
+
 Configure Invalid Static IPv6 And Verify
     [Documentation]  Configure invalid static IPv6 and verify.
     [Tags]  Configure_Invalid_Static_IPv6_And_Verify