Refactor `OC\Server::getLazyRootFolder` #2447

Job	Run time
changes	7s
integration-sqlite (capabilities_features, 8.2, main)	3m 44s
integration-sqlite (collaboration_features, 8.2, main)	5m 35s
integration-sqlite (comments_features, 8.2, main)	1m 51s
integration-sqlite (dav_features, 8.2, main)	4m 27s
integration-sqlite (features, 8.2, main)	10m 59s
integration-sqlite (federation_features, 8.2, main)	8m 3s
integration-sqlite (--tags ~@large files_features, 8.2, main)	6m 55s
integration-sqlite (filesdrop_features, 8.2, main)	4m 20s
integration-sqlite (openldap_features, 8.2, main)	3m 59s
integration-sqlite (openldap_numerical_features, 8.2, main)	4m 6s
integration-sqlite (ldap_features, 8.2, main)	1m 9s
integration-sqlite (remoteapi_features, 8.2, main)	3m 56s
integration-sqlite (setup_features, 8.2, main)	42s
integration-sqlite (sharees_features, 8.2, main)	7m 10s
integration-sqlite (sharing_features, 8.2, main)	19m 39s
integration-sqlite (videoverification_features, 8.2, main)	8m 18s
integration-sqlite-summary	5s
	1h 35m 5s

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