Address high IOPs usage of the Gnocchi Ceph pool #682

Job	Run time
doc (docs)	1m 41s
doc (docs-gnocchi-web)	1m 48s
test (py39, postgresql-file-upgrade-from-4.4)	2m 47s
check (build)	45s
test (py39, mysql-file)	3m 10s
check (pep8)	40s
test (py39, mysql-file-sqlalchemy14)	3m 15s
test (py39, mysql-swift)	3m 44s
test (py39, mysql-s3)	3m 59s
test (py39, postgresql-file)	2m 59s
test (py39, postgresql-file-sqlalchemy14)	2m 59s
test (py39, postgresql-swift)	3m 35s
test (py39, postgresql-s3)	3m 32s
test (py311, postgresql-file-upgrade-from-4.4)	2m 46s
test (py311, mysql-file)	3m 5s
test (py311, mysql-file-sqlalchemy14)	3m 0s
test (py311, mysql-swift)	3m 41s
test (py311, mysql-s3)	3m 40s
test (py311, postgresql-file)	2m 44s
test (py311, postgresql-file-sqlalchemy14)	2m 50s
test (py311, postgresql-swift)	3m 20s
test (py311, postgresql-s3)	3m 31s
	1h 3m 31s

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