pmqos: Add new SetScenario method for pmqos dbus interface

pmqos: Add new SetScenario method for pmqos dbus interface

When add new scenario to pmqos, it have to edit the code.
It is not extensible. In order to improve the extensiblity
without code changes, add new SetScenario method for pmqos dbus interface
as following: When need to add new scenario, just add new scenario info.
to scripts/pass-pmqos.conf (/etc/pass/pass-pmqos.conf) without any code
changes.

[Interface for new SetScenario method of pmqos dbus]
- dbus interface : org.tizen.system.pass.pmqos.SetScenario
- parameter 1: scenario name like AppLaunch
- parameter 2: duration time like 3000 means 3 second

Change-Id: I5ee8da4ec62a9cf1d55ea51f6c7fb8ca9ce7b9e7
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>