Better OmegaConf error reporting

[bwsw]

Now, when OmegaConf contains incorrect keys, the system results in an error, including a stack trace, exception, and actual error. We do not need to display the service information except the actual problem.

The actual report can be like:

[ERROR] Configuration parsing error: the key local is not known in the object NvInferDetector.

If we can display a YAML block containing the error, it would be awesome.