Redis: Fix sentinel fallbacks with IPv6 address #675

Job	Run time
doc (docs)	1m 44s
doc (docs-gnocchi-web)	1m 48s
check (build)	44s
check (pep8)	40s
test (py39, postgresql-file-upgrade-from-4.4)	2m 38s
test (py39, mysql-file)	3m 8s
test (py39, mysql-file-sqlalchemy14)	3m 2s
test (py39, mysql-swift)	3m 49s
test (py39, mysql-s3)	4m 12s
test (py39, postgresql-file)	2m 53s
test (py39, postgresql-file-sqlalchemy14)	2m 51s
test (py39, postgresql-swift)	3m 33s
test (py39, postgresql-s3)	3m 30s
test (py311, postgresql-file-upgrade-from-4.4)	2m 34s
test (py311, mysql-file)	3m 8s
test (py311, mysql-file-sqlalchemy14)	2m 59s
test (py311, mysql-swift)	3m 26s
test (py311, mysql-s3)	3m 35s
test (py311, postgresql-file)	2m 51s
test (py311, postgresql-file-sqlalchemy14)	2m 42s
test (py311, postgresql-swift)	3m 29s
test (py311, postgresql-s3)	3m 30s
	1h 2m 46s

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