Make the encryption:encrypt-all command to accept "-y" as input option
Make the encryption:encrypt-all command to accept "-y" as input option

- Fixes https://github.com/owncloud/encryption/issues/33 and https://github.com/owncloud/enterprise/issues/339

Manually by running the encryption:encrypt-all -y command and see that files get correctly encrypted

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)
- [ ] Technical debt
- [ ] Tests

- [x] Code changes
- [ ] Unit tests added
- [ ] Acceptance tests added
- [ ] Documentation ticket raised: <link>

<!-- In case of incomplete PR, please list the open tasks here -->
- [x] Backport (if applicable set "backport-request" label and remove when the backport was done)

owncloud/core,owncloud/core,phil-davis/core,owncloud/core,owncloud/core,owncloud/core