Update cipher test suite command option

Resolves  openbmc/openbmc-test-automation#2176

Change-Id: I8c86388d509000215a034a2f83f93f2ec22867ba
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/security/test_bmc_ssh_security.robot b/security/test_bmc_ssh_security.robot
index fae0628..7ea06fe 100644
--- a/security/test_bmc_ssh_security.robot
+++ b/security/test_bmc_ssh_security.robot
@@ -50,6 +50,15 @@
 
     Printn
     ${ssh_cmd_buf}=  Catenate  ssh -o NumberOfPasswordPrompts=0 UserKnownHostsFile=/dev/null
-    ...  StrictHostKeyChecking=no -vv ${OPENBMC_HOST} 2>&1
+    ...  -o StrictHostKeyChecking=no -vv ${OPENBMC_HOST} 2>&1
+
+    ${rc}  ${std_err}=  Shell Cmd  ! ${ssh_cmd_buf}
+    Log  std_err=${std_err}  console=yes
+    Log  rc=${rc} console=yes
+
+    ${has_it}=  Run Keyword And Return Status  Should Contain  ${std_err}  Permission denied
+    Skip If  not ${has_it}
+    ...  Skipping test case since response is not as expected
+
     Shell Cmd  ! ${ssh_cmd_buf} | egrep -- "${weak_key_regex}"
     Shell Cmd  ! ${ssh_cmd_buf} | egrep -- "${mac_key_regex}"