security: Fix valgrind output file

security: Fix valgrind output file

It was generated into iotivity/ut instead of .memcheck file.

Bug: https://jira.iotivity.org/browse/IOT-2599
Change-Id: Ib96a6378513df77e7415378cd37a864fa0cbebb9
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/22021
Reviewed-by: Alex Kelley <alexke@microsoft.com>
Reviewed-by: Pawel Winogrodzki <pawelwi@microsoft.com>
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>