Added AMS functionality to support on-demand ACL provisioning.

Added AMS functionality to support on-demand ACL provisioning.

This change includes the new "AMS Manager" (amsmgr.c) module, as well
as modifications to the SRM proper, policy engine, and doxmresource,
which are required to enable Access Management Service functionality in
the SRM.

Change-Id: Ibf10e00bebeeafd238ac083c7d45c1bbf7a46dd3
Signed-off-by: Shilpa Sodani <shilpa.a.sodani@intel.com>
Signed-off-by: Sachin Agrawal <sachin.agrawal@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2486
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>