resource-encapsulation: Fix test's output filename

resource-encapsulation: Fix test's output filename

Align to other .memcheck suffixes for valgrind

Bug: https://jira.iotivity.org/browse/IOT-2599
Change-Id: Id51f1b3168226b83710a2047f4256cce7bf6f129
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/21993
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>
Reviewed-by: Mats Wichmann <mats@linux.com>
(cherry picked from commit 7f5c93862a43c2234b43df93d94fa532eb75ee32)