[IOT-1917]Fix memory leak: cert/key/CRL

[IOT-1917]Fix memory leak: cert/key/CRL

Fix memory leak: cert/key/CRL information returned by cred resource
https://jira.iotivity.org/browse/IOT-1917

Change-Id: Ic563b5e5b79ccac8855ebb5b215e475d1b4e57be
Signed-off-by: Oleksandr Dmytrenko <o.dmytrenko@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/18057
Reviewed-by: Andrii Shtompel <a.shtompel@samsung.com>
Reviewed-by: Kevin Kane <kkane@microsoft.com>
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Greg Zaverucha <gregz@microsoft.com>