Refactor `OC\Server::getHasher` #2442

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.2, main)	4m 11s
integration-sqlite (collaboration_features, 8.2, main)	5m 25s
integration-sqlite (comments_features, 8.2, main)	1m 53s
integration-sqlite (dav_features, 8.2, main)	4m 38s
integration-sqlite (features, 8.2, main)	12m 16s
integration-sqlite (federation_features, 8.2, main)	2m 37s
integration-sqlite (--tags ~@large files_features, 8.2, main)	6m 37s
integration-sqlite (filesdrop_features, 8.2, main)	3m 40s
integration-sqlite (openldap_features, 8.2, main)	4m 1s
integration-sqlite (openldap_numerical_features, 8.2, main)	4m 0s
integration-sqlite (ldap_features, 8.2, main)	4m 5s
integration-sqlite (remoteapi_features, 8.2, main)	3m 30s
integration-sqlite (setup_features, 8.2, main)	3m 25s
integration-sqlite (sharees_features, 8.2, main)	2m 44s
integration-sqlite (sharing_features, 8.2, main)	10m 45s
integration-sqlite (videoverification_features, 8.2, main)	3m 18s
integration-sqlite-summary	4s
	1h 17m 15s

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