Prepare scripts for Coverity (#1236)

Prepare scripts for Coverity (#1236)

* Prepare scripts for Coverity

- Add run_coverity.sh
- Add Coverity_Tizen_SelfVerification_2017.07.0.sh

Signed-off-by: Hyung-Kyu Choi <hk0110.choi@samsung.com>
* Download Coverity script from server

- Download Coverity script from server, instead of maintaining in this repo

Signed-off-by: Hyung-Kyu Choi <hk0110.choi@samsung.com>
* Receive name of Coverity script as a parameter

- Receive name of Coverity script as a parameter

Signed-off-by: Hyung-Kyu Choi <hk0110.choi@samsung.com>
* Use consistent convention for variables

- Add a description about variable name convention
- Rename variables to follow convention

Signed-off-by: Hyung-Kyu Choi <hk0110.choi@samsung.com>