Comment out mount_file config option

Prevents sample config issues with external storages. Fixes #9734
Stream downloads from Swift object stores without downloading it first
Throw exception if file cannot be accessed via http

Format file

Removing calls to deprecated classes and using internal method to get via http

Missed a character

Fix inverted logic
Merge pull request #9818 from owncloud/fix-mount-file-config

Comment out mount_file config option
Merge pull request #10528 from owncloud/fix-htaccess-check-error

Fix htaccess check error
[tx-robot] updated from transifex
Merge pull request #10595 from owncloud/swift-stream

Stream downloads from Swift object stores without downloading it first