Fix Android EDR memory leak

Fix Android EDR memory leak

Android applications with EDR adpater always get crashed after
running for few minutes. The exception says that the JNI local reference
table is overflow, due to some memory not released by GC.

Change-Id: Ie274d7b28ab9f187728f04aa0dceaa4ebcb61240
Signed-off-by: Yu-Hsin Hung <hungys@hotmail.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2099
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>