Implementing test cases for Artery scenarios

[AshFungor]

Hey!

This is my PR for initial testing. The goal here is to create a framework for testing scenarios and implement a couple of them to demonstrate how to use it.

Part of this job is to wrap some CLI tools with Python, namely:

• scavetool to generate .csv data from scalars & vectors
• opp_run for actual scenario running

sim-runner relies upon run_artery.sh to provide necessary shared libraries & NED folders for simulation. It creates temporary config file which adds verbosity to scenario output for further analysis in tests.

[riebl]

I am a little bit surprised about the usage of scavetool. Since vectors and scalars are recorded in SQLite format, I think it is much easier (and less error-prone) to read the database files directly via Python's sqlite3 module.

[AshFungor]

It seems that pandas can read sqlite3 as well. I will test this and avoid using scavetool then :)