Add GUI automation to verify message for no events logs

This commit verifies the message in overview page when there
is no high priority events

Change-Id: I6513e0432fa5f96fac0af698729ff6263fd95799
Signed-off-by: manashsarma <manashsarma@in.ibm.com>
diff --git a/gui/data/resource_variables.py b/gui/data/resource_variables.py
index f85dc9e..0f50c25 100644
--- a/gui/data/resource_variables.py
+++ b/gui/data/resource_variables.py
@@ -134,6 +134,7 @@
     xpath_server_health_header = "//*[@data-test-id='appHeader-container-health']"
     xpath_event_header = "//h1[text()='Event logs']"
     xpath_server_power_header = "//*[@data-test-id='appHeader-container-power']"
+    xpath_refresh_button = "//*[@data-test-id='appHeader-button-refresh']"
 
     # xpath for health menu
     xpath_health_menu = "//button[@aria-controls='health-menu']"