Add redfish event log filter keyword

Changes:
     - New keyword to filter event log

Tested: - Tested on sandbox test sample code
Change-Id: I6bb911d023fcbf0514a48d513c17e8cb2d2cc8b0
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/logging_utils.robot b/lib/logging_utils.robot
index 9bb9821..b2bb56c 100644
--- a/lib/logging_utils.robot
+++ b/lib/logging_utils.robot
@@ -20,6 +20,20 @@
 
 *** Keywords ***
 
+Filter Expected Logging Events
+    [Documentation]  Get redfish logging entry, remove the user input expected
+    ...              log event and return the object list.
+    [Arguments]  ${expected_event}=None
+
+    # Description of argument(s):
+    # expected_eventd   Event log list.
+
+    ${all_event_list}=  Get Redfish Event Logs
+    Remove Values From List  ${all_event_list}  ${expected_event}
+
+    [Return]  ${all_event_list}
+
+
 Get Logging Entry List
     [Documentation]  Get logging entry and return the object list.