Update keywords in sol003_02 to avoid duplicates

Change-Id: I0d1aa6289f3be927e72972153c45a294686d828d
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

robot-systest/lib/ns_lib.resource

@@ -212,7 +212,7 @@ Get VDU Affinity Group Name
     Should Be Equal As Integers   ${rc}   ${SUCCESS_RETURN_CODE}   msg=${affinity_group_name}   values=False
     RETURN   ${affinity_group_name}
 
-GET Dual Ip
+Get Dual Ip
     [Documentation]   Get dual ip from the ns list
     [Arguments]   ${ns_id}
     Should Not Be Empty   ${ns_id}

robot-systest/testsuite/sol003_02-dualstack_ip_vnfm.robot

@@ -96,7 +96,7 @@ Get Ns Id
     ${id}=   Get Ns Id   ${ns_name}
     Set Suite Variable   ${NS_ID}   ${id}
 
-Get Dual Ip
+Get Dual Ip Addresses
     [Documentation]   Get the IP address from the NS
     ${id}=   Get Dual Ip   ${NS_ID}
     Set Suite Variable   ${DUAL_IP}   ${id}