[VOL-5584] Replace deprecated [Return] settings with RETURN across repository

Change-Id: Ia0231ed837c4407440fe93c6bf36c7a55edb7bea
Signed-off-by: Serkant Uluderya <serkant.uluderya@netsia.com>
diff --git a/tests/tt-workflow/Voltha_TT_MulticastTests.robot b/tests/tt-workflow/Voltha_TT_MulticastTests.robot
index 3ed657f..d4990ab 100644
--- a/tests/tt-workflow/Voltha_TT_MulticastTests.robot
+++ b/tests/tt-workflow/Voltha_TT_MulticastTests.robot
@@ -227,7 +227,7 @@
         ...    True    False
         Exit For Loop If    ${matched}
     END
-    [Return]    ${matched}    ${src}    ${dst}
+    RETURN    ${matched}    ${src}    ${dst}
 
 
 TT 2 RG MCAST Test