2022.01 Minor fixes in the description of tasks 12.1, 20.1, 23.2 and test 18.1a

• Clarified the wording of tasks 12.1, 20.1, 23.2
• Small change in test 18.1a to account for exception text in different versions of netmiko

If you are already solving tasks, you can clone the tasks repository locally and then manually copy the updated dirs (files) to your repo.

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2021.07 Updated tasks and tests

• All tests have been changed so that to the left of == assert is the correct version of the output, and to the right is the output from the task.
  Now, pytest-clarity shows in green the correct option, in red what is received from the task
• Updated pyneng utility and pytest.ini config files - removed pytest option due to pytest-clarity update
• updated tasks, most of them small changes, clarification of the wording
• removed task (test): 15.2a
• Updated pyneng_common_functions.py file in exercises directory

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