Remove default override for policy_file option #882

Job	Run time
doc (docs)	1m 37s
doc (docs-gnocchi-web)	1m 39s
check (build)	43s
test (py39, postgresql-file-upgrade-from-4.5)	2m 42s
check (pep8)	38s
test (py39, mysql-file)	3m 12s
test (py39, mysql-file-sqlalchemy14)	3m 15s
test (py39, mysql-swift)	3m 28s
test (py39, mysql-s3)	4m 20s
test (py39, postgresql-file)	2m 47s
test (py39, postgresql-file-sqlalchemy14)	2m 51s
test (py39, postgresql-swift)	3m 13s
test (py39, postgresql-s3)	3m 54s
test (py311, postgresql-file-upgrade-from-4.5)	2m 57s
test (py311, mysql-file)	2m 56s
test (py311, mysql-file-sqlalchemy14)	2m 53s
test (py311, mysql-swift)	3m 18s
test (py311, mysql-s3)	3m 59s
test (py311, postgresql-file)	2m 45s
test (py311, postgresql-file-sqlalchemy14)	2m 41s
test (py311, postgresql-swift)	3m 15s
test (py311, postgresql-s3)	3m 24s
test (py312, mysql-ceph-upgrade-from-4.5)	2m 36s
test (py312, postgresql-file-upgrade-from-4.5)	2m 33s
test (py312, mysql-file)	2m 53s
test (py312, mysql-file-sqlalchemy14)	2m 59s
test (py312, mysql-swift)	3m 19s
test (py312, mysql-s3)	3m 50s
test (py312, postgresql-file)	2m 43s
test (py312, postgresql-file-sqlalchemy14)	2m 43s
test (py312, postgresql-swift)	3m 18s
test (py312, postgresql-s3)	3m 29s
	1h 32m 50s

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