Squashed 'helpers/' changes from bc04786..3142e3c
Squashed 'helpers/' changes from bc04786..3142e3c

3142e3c VFS-1472 Fix set user context in Amazon S3 storage helper.

git-subtree-dir: helpers
git-subtree-split: 3142e3c8693a8b593ab7c1540255e2ce28216cc6

onedata/op-worker,onedata/op-worker,onedata/op-worker