Fixes pylint error:
- package/test_tools/__private/scripts/update_wallet_api.py:172:4: W1510: Using subprocess.run without explicitly set `check` is not recommended. (subprocess-run-check)

Fixes pylint error:
- package/test_tools/__private/scripts/update_wallet_api.py:10:0: R0402: Use 'from test_tools.__private import wallet' instead (consider-using-from-import)

Fixes pylint error:
- package/test_tools/__private/scripts/update_wallet_api.py:174:29: W0212: Access to a protected member __private of a client class (protected-access)

New version of pylint does not take into account
functiom signatures when searching for code duplicates. (2.14.0)

It is nice to have all abstract methods defined right
after the dunder/magic methods, so it is easy to see
which methods child class should implement.

The changes are motivated by the fact that
validate() method located in the List class has to
be an instance method (cause each List object holds
the information about it's internal item type) and this is
incompatible with the ConfigEntry interface which imposes a class method.

Due to a wrong parameter passed to the dunder __setattr__ method
which was '__entries' instead of '_NodeConfig__entries' we ran
into the RecursionError, because __getattr__ was calling itself
since '__entries' attribute cannot be found.

For more information read the `Note` here:
https://docs.python.org/3/library/functions.html#getattr

Fixes pylint error:
- package/test_tools/__private/node_config.py:129:15: C2801: Unnecessarily calls dunder method __getattribute__. Access attribute directly or use getattr built-in function. (unnecessary-dunder-call)

This reverts commit 2afd4339.