Remove tabs in robot files in favour of spaces, add chek in stage-test

Change-Id: I5ab7d35ee16557b00caf3dc0f136e6b01f948b0c
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/robot-systest/lib/nsi_lib.robot b/robot-systest/lib/nsi_lib.robot
index 7d5f8fa..005d536 100644
--- a/robot-systest/lib/nsi_lib.robot
+++ b/robot-systest/lib/nsi_lib.robot
@@ -160,7 +160,7 @@
     ${rc}   ${stdout}=   Run and Return RC and Output   osm nsi-list --filter name="${slice_name}"
     log   ${stdout}
     Should Be Equal As Integers   ${rc}   ${success_return_code}
-    Should Contain Any   ${stdout}   READY   BROKEN	configured
+    Should Contain Any   ${stdout}   READY   BROKEN   configured
 
 
 Check For Network Slice Instance For Failure