fix: Convert aws_token to string since sometimes it's unicode

[huali027]

When I test the playbooks, I found the spec "aws_instance_id_doc" can not be collected on RHEL 7.5:

2022-12-23 08:42:34,794     INFO insights.core.dr Trying insights.specs.default.DefaultSpecs.aws_instance_id_doc
2022-12-23 08:42:34,794    DEBUG insights.core.plugins The provider can only be a single string or a tuple of strings, but got 'AQAAAPTeS4-aK9v5iEb27uBubd5HjzogWpB_-0K1_sgGoVverKIrkg=='.

After debugging it, I found the return type of aws_imdsv2_token is unicode.

Signed-off-by: Huanhuan Li [email protected]

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[huali027]

@xiangce Please help to review, thanks.

[xiangce]

@huali027 - please 1. add the relevant description or add the issue; 2. add corresponding tests; 3. check the checkboxes if you finished them.

[xiangce]

Per discussion, no need to add tests for this change.