Swift: Add a config option for prefixing all containers #912

Job	Run time
doc (docs)	1m 38s
doc (docs-gnocchi-web)	1m 38s
check (build)	47s
check (pep8)	36s
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 37s
test (py311, mysql-file)	1m 40s
test (py311, mysql-file-sqlalchemy14)	1m 36s
test (py311, mysql-swift)	1m 22s
test (py311, mysql-s3)	1m 37s
test (py311, postgresql-file)	1m 39s
test (py311, postgresql-file-sqlalchemy14)	1m 37s
test (py311, postgresql-swift)	1m 36s
test (py311, postgresql-s3)	1m 37s
test (py312, mysql-ceph-upgrade-from-4.5)	1m 37s
test (py312, postgresql-file-upgrade-from-4.5)	35s
test (py312, mysql-file)	1m 37s
test (py312, mysql-file-sqlalchemy14)	1m 37s
test (py312, mysql-swift)	1m 36s
test (py312, mysql-s3)	1m 38s
test (py312, postgresql-file)	1m 38s
test (py312, postgresql-file-sqlalchemy14)	1m 37s
test (py312, postgresql-swift)	1s
test (py312, postgresql-s3)	1s
	31m 6s

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