Refactor `OC\Server::getGetRedisFactory` #2448

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.2, main)	4m 11s
integration-sqlite (collaboration_features, 8.2, main)	5m 48s
integration-sqlite (comments_features, 8.2, main)	5m 5s
integration-sqlite (dav_features, 8.2, main)	8m 45s
integration-sqlite (features, 8.2, main)	5m 52s
integration-sqlite (federation_features, 8.2, main)	6m 57s
integration-sqlite (--tags ~@large files_features, 8.2, main)	6m 47s
integration-sqlite (filesdrop_features, 8.2, main)	3m 54s
integration-sqlite (openldap_features, 8.2, main)	3m 46s
integration-sqlite (openldap_numerical_features, 8.2, main)	3m 56s
integration-sqlite (ldap_features, 8.2, main)	4m 23s
integration-sqlite (remoteapi_features, 8.2, main)	3m 42s
integration-sqlite (setup_features, 8.2, main)	50s
integration-sqlite (sharees_features, 8.2, main)	6m 19s
integration-sqlite (sharing_features, 8.2, main)	11m 24s
integration-sqlite (videoverification_features, 8.2, main)	8m 20s
integration-sqlite-summary	6s
	1h 30m 11s

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