Fix listing metrics as non-admin without creator policy defined #909

Job	Run time
doc (docs)	1m 35s
check (build)	45s
doc (docs-gnocchi-web)	1m 42s
test (py39, postgresql-file-upgrade-from-4.5)	2m 41s
check (pep8)	48s
test (py39, mysql-file)	2m 55s
test (py39, mysql-file-sqlalchemy14)	2m 55s
test (py39, mysql-swift)	3m 38s
test (py39, mysql-s3)	4m 8s
test (py39, postgresql-file)	2m 45s
test (py39, postgresql-file-sqlalchemy14)	2m 41s
test (py39, postgresql-swift)	3m 11s
test (py39, postgresql-s3)	3m 40s
test (py311, postgresql-file-upgrade-from-4.5)	2m 39s
test (py311, mysql-file)	3m 2s
test (py311, mysql-file-sqlalchemy14)	2m 57s
test (py311, mysql-swift)	3m 25s
test (py311, mysql-s3)	3m 58s
test (py311, postgresql-file)	2m 39s
test (py311, postgresql-file-sqlalchemy14)	2m 44s
test (py311, postgresql-swift)	3m 7s
test (py311, postgresql-s3)	3m 22s
test (py312, mysql-ceph-upgrade-from-4.5)	2m 40s
test (py312, postgresql-file-upgrade-from-4.5)	2m 35s
test (py312, mysql-file)	3m 4s
test (py312, mysql-file-sqlalchemy14)	2m 47s
test (py312, mysql-swift)	3m 30s
test (py312, mysql-s3)	3m 49s
test (py312, postgresql-file)	2m 49s
test (py312, postgresql-file-sqlalchemy14)	2m 46s
test (py312, postgresql-swift)	3m 7s
test (py312, postgresql-s3)	3m 25s
	1h 31m 49s

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