Fix metric aggregates as non-admin #905

Job	Run time
doc (docs)	1m 49s
doc (docs-gnocchi-web)	1m 45s
check (build)	40s
check (pep8)	37s
test (py39, postgresql-file-upgrade-from-4.5)	1s
test (py39, mysql-file)	1s
test (py39, mysql-file-sqlalchemy14)	1s
test (py39, mysql-swift)	1s
test (py39, mysql-s3)	1s
test (py39, postgresql-file)	1s
test (py39, postgresql-file-sqlalchemy14)	1s
test (py39, postgresql-swift)	1s
test (py39, postgresql-s3)	1s
test (py311, postgresql-file-upgrade-from-4.5)	1m 41s
test (py311, mysql-file)	1m 41s
test (py311, mysql-file-sqlalchemy14)	1m 42s
test (py311, mysql-swift)	1m 42s
test (py311, mysql-s3)	1m 41s
test (py311, postgresql-file)	1m 41s
test (py311, postgresql-file-sqlalchemy14)	1m 42s
test (py311, postgresql-swift)	1m 27s
test (py311, postgresql-s3)	1m 24s
test (py312, mysql-ceph-upgrade-from-4.5)	1m 40s
test (py312, postgresql-file-upgrade-from-4.5)	58s
test (py312, mysql-file)	1m 42s
test (py312, mysql-file-sqlalchemy14)	1m 41s
test (py312, mysql-swift)	1m 40s
test (py312, mysql-s3)	1m 41s
test (py312, postgresql-file)	1m 39s
test (py312, postgresql-file-sqlalchemy14)	1m 40s
test (py312, postgresql-swift)	1s
test (py312, postgresql-s3)	1s
	32m 24s

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