Use oslo.utils method to parse server format #848

Job	Run time
check (build)	37s
doc (docs)	1m 25s
check (pep8)	45s
test (py39, postgresql-file-upgrade-from-4.5)	2m 33s
doc (docs-gnocchi-web)	1m 25s
test (py39, mysql-file)	3m 3s
test (py39, mysql-file-sqlalchemy14)	2m 55s
test (py39, mysql-swift)	3m 17s
test (py39, mysql-s3)	3m 49s
test (py39, postgresql-file)	2m 40s
test (py39, postgresql-file-sqlalchemy14)	2m 37s
test (py39, postgresql-swift)	3m 9s
test (py39, postgresql-s3)	3m 36s
test (py311, postgresql-file-upgrade-from-4.5)	2m 25s
test (py311, mysql-file)	2m 51s
test (py311, mysql-file-sqlalchemy14)	2m 48s
test (py311, mysql-swift)	3m 33s
test (py311, mysql-s3)	3m 39s
test (py311, postgresql-file)	2m 39s
test (py311, postgresql-file-sqlalchemy14)	2m 51s
test (py311, postgresql-swift)	3m 12s
test (py311, postgresql-s3)	3m 11s
	59m 0s

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