Fix BMC dump automated testcase

Changes:
       - Added fix for automation test case
        'Verify BMC Dump Create Errors While Another BMC Dump In Progress'.

Tested:
       - Ran the test case with fix from sandbox successfully.

Change-Id: Ie099a11454e02a504177c78aee2c73b55ec9ca54
Signed-off-by: manashsarma <manashsarma@in.ibm.com>
diff --git a/redfish/managers/test_bmc_dumps.robot b/redfish/managers/test_bmc_dumps.robot
index 65ec04f..3fa4382 100644
--- a/redfish/managers/test_bmc_dumps.robot
+++ b/redfish/managers/test_bmc_dumps.robot
@@ -382,6 +382,8 @@
     END
 
     # The next BMC dump initiation request should be accepted as earlier dump is completed.
+    # Wait for few seconds before initiating the dump.
+    Sleep  2s
     ${resp}=  Redfish.Post
     ...  /redfish/v1/Managers/bmc/LogServices/Dump/Actions/LogService.CollectDiagnosticData
     ...  body=${payload}  valid_status_codes=[${HTTP_ACCEPTED}]