[IOT-1950] Add default ACL for roles resource

[IOT-1950] Add default ACL for roles resource

Update the default ACL to include access to the roles resource.
Fix double-free on error paths in GetDefaultACL.
Update .json/.dat files for samples and unit tests containing the default ACL.
Remove workaround from end-to-end tests.
Add unit test to check default ACL includes ACE for roles resource.

Change-Id: Icff8e64195f1ce75ad6e3b05c8e2de1763eaf653
Signed-off-by: Greg Zaverucha <gregz@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/18465
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Alex Kelley <alexke@microsoft.com>
Reviewed-by: Kevin Kane <kkane@microsoft.com>