fix: update MaaS tests for subscription binding and fix gateway 500 e…

[SB159]

…… (#1303)

• fix: update MaaS tests for subscription binding and fix gateway 500 error

• address review comment

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Pull Request

Summary

Related Issues

• Fixes:
• JIRA:

Please review and indicate how it has been tested

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• Jenkins

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Status of building tag 3.4ea2: success.
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