EasySetup:Applied "href" and "rep" to POST request

EasySetup:Applied "href" and "rep" to POST request

IOT-2713: https://jira.iotivity.org/browse/IOT-2713

- Applied "href" and "rep" to POST request using oic.if.b (batch interface).
- Updated the handling for provision wifi & cloud properties
- Verified Enrollee & Mediator on Linux with sample apps.
- Linux Unit tests verified locally.
- Also fixed on build warning in easysetup_x.c (sample app).

Change-Id: I5e5d7c495d45dd8eb41ca5bcce2af8e18fd53c71
Signed-off-by: Abhishek Pandey <abhi.siso@samsung.com>