Admin mode metadata(admin=True) is not honored for apply_atomic_operations

[paulborgermans]

• code change
• test

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While implementing some workflows with bulk operations on metadata, we noticed that Admin mode is not working for atomic metadata operations.

The admin_mode parameter is actually not sent in the json message
PR that fixes it for us follows

[paulborgermans]

PR: #577

[alanking]

Thanks, @paulborgermans and @d-w-moore!