Remove the use of the future module (backport #1366) #769

Job	Run time
doc (docs)	1m 29s
check (build)	48s
doc (docs-gnocchi-web)	1m 17s
test (py39, postgresql-file-upgrade-from-4.4)	1m 31s
check (pep8)	47s
test (py39, mysql-file)	1m 49s
test (py39, mysql-file-sqlalchemy14)	1m 47s
test (py39, mysql-swift)	1m 47s
test (py39, mysql-s3)	1m 47s
test (py39, postgresql-file)	1m 46s
test (py39, postgresql-file-sqlalchemy14)	1m 46s
test (py39, postgresql-swift)	49s
test (py39, postgresql-s3)	54s
test (py311, postgresql-file-upgrade-from-4.4)	1m 30s
test (py311, mysql-file)	1m 49s
test (py311, mysql-file-sqlalchemy14)	1m 49s
test (py311, mysql-swift)	1m 47s
test (py311, mysql-s3)	1m 47s
test (py311, postgresql-file)	1m 53s
test (py311, postgresql-file-sqlalchemy14)	1m 47s
test (py311, postgresql-swift)	1m 48s
test (py311, postgresql-s3)	1m 48s
	34m 15s

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