Revert "Download: add to support pause/resume download by manual"

This reverts commit b76a3bd53a8b136b63624df87046bcf368bf01c4.
[1/2] Add to support pause/resume download

We add pause and resume API here so that application can
pause and resume downloads manually by DownloadManager.
This contains two points:
1. add pause and resume download APIs.
2. add another paused reason for this download status.

PS2/3:
* Fix code.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: I606b48ca20f43bcc6c119683818c2ab6ff03bfe5