Support stop system service

[carolwu-1206]

Issue Description

feature request
Type: bug report , feature request or question

Describe what happened (or what feature you want)

There is process kill feature in Chaosblade. But when the process is managed by a system service, the "timeout" field will be useless. Once the process is killed, another one will be triggered by the service. We cannot simulate the scene that the system is down for a while.

Describe what you expected to happen

How to reproduce it (as minimally and precisely as possible)

Tell us your environment

Anything else we need to know?

[xcaspar]

Thanks for your contributions.