Adding configuration templates for validation

It still need to finish documentation and add some other special parameters.
which will allow to choose which instance to use, number of jobs, submit only one test, and not all at the same time.
Maybe I am missing some of templates, let me know.
Also later I will add script for checking all sites.

Whenever we will have fully supported CrabClient API, we can also extend it in python and to have also check for API.