allow forward slashes in child bucket sub-path

[TimCsaky]

Description

Types of changes

New feature (non-breaking change which adds functionality)

Checklist

• [x] I have read the CONTRIBUTING doc
• [x] I have checked that unit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)

Further comments

[github-actions[bot]]

Coverage Report

Totals
Statements:	61.1% ( 3047 / 4987 )
Methods:	50.99% ( 335 / 657 )
Lines:	68.13% ( 1830 / 2686 )
Branches:	53.65% ( 882 / 1644 )

[codeclimate[bot]]

Code Climate has analyzed commit 9f7d1d48 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 68.1% (0.0% change).

View more on Code Climate.