Added coexistence of linklocalv6 and slaac verification test

Changes:
    - Added the test case:
    Verify Coexistence Of Linklocalv6 And SLAAC On BMC

    Tested:
        Ran and Tested on BMC Environment.
Change-Id: Ie1097463b0bb45a198f964f024568a2e98b74dd3
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 df431ad..7d8b902 100644
--- a/redfish/managers/test_bmc_ipv6.robot
+++ b/redfish/managers/test_bmc_ipv6.robot
@@ -307,7 +307,7 @@
 
 
 Verify Coexistence Of Static IPv6 And SLAAC On BMC
-    [Documentation]  Verify static IPv6 And SLAAC both exist.
+    [Documentation]  Verify static IPv6 And SLAAC both coexist.
     [Tags]  Verify_Coexistence_Of_Static_IPv6_And_SLAAC_On_BMC
     [Setup]  Configure IPv6 Address On BMC  ${test_ipv6_addr}  ${test_prefix_length}
              Set SLAAC Configuration State And Verify  ${True}
@@ -328,6 +328,16 @@
     Check Coexistence Of Link Local And DHCPv6
 
 
+Verify Coexistence Of Link Local And SLAAC On BMC
+    [Documentation]  Verify link local And SLAAC both coexist.
+    [Tags]  Verify_Coexistence_Of_Link_Local_And_SLAAC_On_BMC
+    [Setup]  Set SLAAC Configuration State And Verify  ${True}
+
+    Sleep  ${NETWORK_TIMEOUT}s
+
+    Check Coexistence Of Link Local And SLAAC
+
+
 *** Keywords ***
 
 Suite Setup Execution
@@ -1008,7 +1018,7 @@
 
 
 Check Coexistence Of Static IPv6 And SLAAC
-    [Documentation]  Verify both static IPv6 and SLAAC exist.
+    [Documentation]  Verify both static IPv6 and SLAAC coexist.
 
     # Verify the address origin contains static and slaac.
     @{ipv6_addressorigin_list}  ${ipv6_static_addr}=
@@ -1018,6 +1028,19 @@
     ...    Get Address Origin List And Address For Type  SLAAC
 
 
+Check Coexistence Of Link Local And SLAAC
+    [Documentation]  Verify both link local and SLAAC coexist.
+
+    # Verify the address origin contains SLAAC and link local.
+    @{ipv6_addressorigin_list}  ${ipv6_link_local_addr}=
+    ...    Get Address Origin List And Address For Type  LinkLocal
+
+    @{ipv6_addressorigin_list}  ${ipv6_slaac_addr}=
+    ...    Get Address Origin List And Address For Type  SLAAC
+
+    Should Match Regexp    ${ipv6_link_local_addr}    ${linklocal_addr_format}
+
+
 Check Coexistence Of Link Local And DHCPv6
     [Documentation]  Verify both link local and dhcpv6 coexist.