provide an API to convert the testflinger-agent queue between public and restricted

[hanhsuan]

OEMQA would like to convert the public queue to restricted during the test period(one to two weeks) then convert it back. This could help OEMQA to debug and reproduce issues without environment are changed unexpected.

[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CERTTF-504.

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