Update logging-test file check on BMC

Changes:
     - Modify BMC execute command keyword and also the
       method using test binary utility command to check
       logging-test file existence on BMC.

Tested:
   Ran successfully
      robot -v OPENBMC_HOST:xx.xx.xx.xx
          -v DEBUG_TARBALL_PATH:./debug-tarball.tar.xz
          redfish/systems/eventlog/test_event_logging.robot

Change-Id: If555ce6f9bbd040a75b21278bc8b506acaf45846
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/logging_utils.robot b/lib/logging_utils.robot
index 74209ab..16222a6 100644
--- a/lib/logging_utils.robot
+++ b/lib/logging_utils.robot
@@ -132,12 +132,10 @@
 
 Logging Test Binary Exist
     [Documentation]  Verify existence of prerequisite logging-test.
-    Open Connection And Log In
-    ${out}  ${stderr}=  Execute Command
-    ...  which /tmp/tarball/bin/logging-test  return_stderr=True
+    ${stdout}  ${stderr}  ${rc}=
+    ...  BMC Execute Command  test -f /tmp/tarball/bin/logging-test  print_out=1
     Should Be Empty  ${stderr}  msg=Logging Test stderr is non-empty.
-    Should Contain  ${out}  logging-test
-    ...  msg=Logging test returned unexpected result.
+
 
 Clear Existing Error Logs
     [Documentation]  If error log isn't empty, reboot the BMC to clear the log.