Summary
When we were adding tiered storage scenarios to "test_alter03.py" it started to fail on the line where we check app metadata for "file:". We pass `app_metadata="meta_data_1"` into WT_SESSION::create. But when we read it we get `app_metadata=meta_data_1`. There are no quotes around meta_data_1. 

"table:" app metadata is fine, it has quotes.

To reproduce the issue just remove the line below FIXME comment.

Acceptance Criteria (Definition of Done)
Remove FIXME comment from "test_alter03.py".