Address high IOPs usage of the Gnocchi Ceph pool #683

Job	Run time
check (build)	40s
doc (docs)	1m 34s
doc (docs-gnocchi-web)	1m 38s
test (py39, postgresql-file-upgrade-from-4.4)	2m 44s
check (pep8)	39s
test (py39, mysql-file)	3m 1s
test (py39, mysql-file-sqlalchemy14)	3m 0s
test (py39, mysql-swift)	3m 46s
test (py39, mysql-s3)	3m 56s
test (py39, postgresql-file)	2m 59s
test (py39, postgresql-file-sqlalchemy14)	2m 49s
test (py39, postgresql-swift)	3m 26s
test (py39, postgresql-s3)	3m 52s
test (py311, postgresql-file-upgrade-from-4.4)	2m 48s
test (py311, mysql-file)	3m 5s
test (py311, mysql-file-sqlalchemy14)	2m 59s
test (py311, mysql-swift)	3m 36s
test (py311, mysql-s3)	3m 48s
test (py311, postgresql-file)	2m 51s
test (py311, postgresql-file-sqlalchemy14)	2m 57s
test (py311, postgresql-swift)	3m 26s
test (py311, postgresql-s3)	3m 39s
	1h 3m 13s

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