Using supported Focus keyword.

Why this change is required:
"Set Focus To Element" keyword only works with latest
selenium2library 3.0.0. At present, our GUI framework
support selenium2library 1.7.4. So using "Focus" keyword
which is compatible with this older selenium2library
version.

Change-Id: I449676fcd06bc1e4d7a5f97bd128ceb832d33632
Signed-off-by: Rahul Maheshwari <rahulmaheshwari@in.ibm.com>
diff --git a/gui/obmc_gui/test/users/test_obmc_gui_manage_user.robot b/gui/obmc_gui/test/users/test_obmc_gui_manage_user.robot
index 2447476..82e089c 100644
--- a/gui/obmc_gui/test/users/test_obmc_gui_manage_user.robot
+++ b/gui/obmc_gui/test/users/test_obmc_gui_manage_user.robot
@@ -48,7 +48,7 @@
    [Documentation]  Do test case setup tasks.
 
     Page Should Contain Element  ${xpath_select_users}
-    Set Focus To Element  ${xpath_select_users}
+    Focus  ${xpath_select_users}
     Click Element  ${xpath_select_users}
     Wait Until Page Does Not Contain Element  ${xpath_refresh_circle}
     Click Element  ${xpath_select_manage_users}