Merge pull request #2158 from akhayrutdinov/ds-provision

[BACKLOG-1495] Add the ability to change the visibility of a data source
[BACKLOG-1562] - Added default Acl node location. Moved default Acl nodes location to ServerRepositoryPaths. Tests updated
Merge pull request #2159 from diogofscmariano/BACKLOG-1562

[BACKLOG-1562] - Added default acl node location. Tests updated
[BACKLOG-1562] Add support for ACL shadow nodes in repository - fix the NPE
[BACKLOG-1562] Add support for ACL shadow nodes in repository - re-implement the Helper to avoid calling runAsSystem