Add support to flush out system dumps

Changes:
     - Added keyword to delete system dumps.
     - Call the new keyword at boot test and clean up path.

Change-Id: Ibdb880b7e0ad07b9097b3c97701fea72c2d4f28a
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/dump_utils.robot b/lib/dump_utils.robot
index b8acd21..eadae80 100644
--- a/lib/dump_utils.robot
+++ b/lib/dump_utils.robot
@@ -176,6 +176,12 @@
     Redfish.Post  /redfish/v1/Managers/bmc/LogServices/Dump/Actions/LogService.ClearLog
 
 
+Redfish Delete All System Dumps
+    [Documentation]  Delete all system  dumps via Redfish.
+
+    Redfish.Post  /redfish/v1/Systems/system/LogServices/Dump/Actions/LogService.ClearLog
+
+
 Delete All BMC Dump
     [Documentation]  Delete all BMC dump entries using "DeleteAll" interface.