Add dump delete all as part of setup

Lately seeing "Insufficient space for at least 7 dumps." during
test run. Turns out if there were dumps leftover, this fails.

Change-Id: Ib68f3d1e3ed6e972b42bb0bb326c374222d3d75e
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/redfish/extended/test_bmc_dump.robot b/redfish/extended/test_bmc_dump.robot
index bea38f7..3c2fc27 100644
--- a/redfish/extended/test_bmc_dump.robot
+++ b/redfish/extended/test_bmc_dump.robot
@@ -150,6 +150,7 @@
     [Documentation]  Verify out of dump space is reported when attempt
     ...  to create too many dumps.
     [Tags]  Dump_Out_Of_Space_Test
+    [Setup]  Delete All BMC Dump
 
     # Systems typically hold 8-14 dumps before running out of dump space.
     # Attempt to create too_many_dumps.  Expect to run out of space