Modify coding idiom and unittest, Add function declaration.

Modify coding idiom and unittest, Add function declaration.

this patch include
1. modify coding idiom.
2. modify unittest about delay time.
3. add function declaration about NSSetResourceSecurity.

Change-Id: Id992c731f057580c060ccf08daee54ba6656250d
Signed-off-by: jaesick.shin <jaesick.shin@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/12517
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Tested-by: Uze Choi <uzchoi@samsung.com>