[IOT-1207] Endpoint C++ API

[IOT-1207] Endpoint C++ API

Provide public C++ api for map ocf endpoint flag to resource in server
and change host of resource in client.

Change-Id: I2f4892144c9732fb38162b7174812fa8c51ce02c
Signed-off-by: bg.chun <bg.chun@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10797
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Dave Thaler <dthaler@microsoft.com>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>