Refactor `OC\Server::getRootFolder` #2440

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.2, main)	1m 1s
integration-sqlite (collaboration_features, 8.2, main)	1m 56s
integration-sqlite (comments_features, 8.2, main)	2m 0s
integration-sqlite (dav_features, 8.2, main)	12m 2s
integration-sqlite (features, 8.2, main)	5m 59s
integration-sqlite (federation_features, 8.2, main)	7m 59s
integration-sqlite (--tags ~@large files_features, 8.2, main)	16m 17s
integration-sqlite (filesdrop_features, 8.2, main)	50s
integration-sqlite (openldap_features, 8.2, main)	1m 1s
integration-sqlite (openldap_numerical_features, 8.2, main)	1m 8s
integration-sqlite (ldap_features, 8.2, main)	5m 0s
integration-sqlite (remoteapi_features, 8.2, main)	4m 25s
integration-sqlite (setup_features, 8.2, main)	4m 27s
integration-sqlite (sharees_features, 8.2, main)	2m 45s
integration-sqlite (sharing_features, 8.2, main)	10m 44s
integration-sqlite (videoverification_features, 8.2, main)	9m 14s
integration-sqlite-summary	5s
	1h 26m 59s

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