Class for config file

[Pavel Yadlouski]

Create a class for the standard creation of config files for that would be edited in the test.
There are already 4 places in the library where the same code is used:

1. Create ConfigParser object: 3 lines (instantiate + set a default value for the object)
2. set value: several lines depending on how much editing would be done
3. Write: 2 - 3 lines

All this can be replaced with a class that inherited ConfigParser class and all workflow would by in 3 lines:

1. Instatiate - all values are set in the constructor
2. Set value - method could take a list of fields that need to be edited
3. Write

[Pavel Yadlouski]

Resolved in PR