Use keyring python module for getting API_TOKEN

Petr Menšíkrequested to merge
pemensik/cli:keyring into main

Keep ability to get TESTING_FARM_API_TOKEN from environment. But if it is not set, try getting it from session keyring.

How to set the keyring token storage: keyring set https://api.dev.testing-farm.io/v0.1 api-token

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