fix(login): clear MAS tokens from config when using token login

[craicoverflow]

Closes #594

Verification Steps

1. Log in using an offline token: rhoas login --token=$TOKEN
2. Run rhoas kafka topic list.
3. You should get the following error message:

Error: not logged in to MAS-SSO. Run "rhoas login" to authenticate. Note: token-based login is not supported by the Kafka admin commands.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation change
• Other (please specify)

Checklist

• Documentation added for the feature
• CI and all relevant tests are passing
• Code Review completed
• Verified independently by reviewer

[wtrocki]

Amazing change! really needed!

[wtrocki]

It is not clear what are kafka admin commands. As user I would go and look rhoas kafka admin but we do mix admin commands with control plane ones. It feels that we need to list them to make it more clear.

Something like this: (although you might have better idea how to do it)

Suggested change

	one = 'not logged in to MAS-SSO. Run "rhoas login" to authenticate. Note: token-based login is not supported by the Kafka admin commands.'
	one = 'not logged in to MAS-SSO. Run "rhoas login" to authenticate. Note: token-based login is not supported by the Kafka topics and consumergroup commands.'

[wtrocki]

Verified. Minor improvement in message is required