Use case-sensitive keyword Log instead of log

Change-Id: I756aedef764cdbbc91d27b6eba060cb4e5fea66b
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/robot-systest/lib/connectivity_lib.robot b/robot-systest/lib/connectivity_lib.robot
index fed1b23..79381e4 100644
--- a/robot-systest/lib/connectivity_lib.robot
+++ b/robot-systest/lib/connectivity_lib.robot
@@ -26,7 +26,7 @@
     [Arguments]   ${host}
 
     ${rc}   ${stdout}=   Run and Return RC and Output   ping -c 2 -W 1 ${host}
-    log   ${stdout}
+    Log   ${stdout}
     Should Be Equal As Integers   ${rc}   ${success_return_code}
 
 Test Connectivity