[Tizen]Fix for LE Server termination issue

[Tizen]Fix for LE Server termination issue

On terminating, LE server doesn't call Disconnect to all the clients
connected.  This patch resolves the issue by maintaining client list
at the server and on terminating, the server disconnects with all
the clients it is connected with.

Change-Id: I0e177dbb3a2803e1d21ccc5a9d0298faa77f5740
Signed-off-by: vimala.v <vimala.v@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/8105
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jon@joncruz.org>