improve e2e test debugging

[FxKu]

print operator log whenever we face a timeout in a test

[sdudoladov]

1. test_enable_load_balancer lacks the proposed change
2. it should be possible to move the

try:
...
except timeout_decorator.TimeoutError:
            print('Operator log: {}'.format(k8s.get_operator_log()))
            raise

part into a decorator of its own. That approach would make code cleaner and easier to re-use.

3. UPD please fix flake8 violations if any

[FxKu]

👍

[sdudoladov]

👍