Add CAcloseSslConnectionFreeEndpoint method

Add CAcloseSslConnectionFreeEndpoint method

[Model] IoTivity
[BinType] AP
[Customer] IoT-Core

[Issue#] CONPRO-1392
[Request] Robert Chudek / r.chudek
[Occurrence Version] n/a

[Problem] After calling CAcloseSslConnection there was a memory leak.
[Cause & Measure] Cause: After calling CAcloseSslConnection endpoint wasn't freed which led to memory leak.
[Checking Method] n/a

[Team] IoT Connection
[Developer] Robert Chudek / r.chudek
[Solution company] Samsung
[Change Type] bug fix

https://github.sec.samsung.net/RS7-IOTIVITY/IoTivity/pull/414
(cherry picked from 18a20af57324bc3d816a862e3aa5194712d2e237)

Change-Id: I283055bea913401c6c23953857b7ccfe5db3581b
Signed-off-by: Abhishek Sansanwal <abhishek.s94@samsung.com>