Remove deleted versions from the cache
add proper version comparision in OC_Installer::isUpdateAvailable
improve check for duplicate apps
Disable legacy encryption tests

It seems these tests are not needed any more, but will now be skipped
instead until the case is cleared out.
Merge pull request #9597 from owncloud/enc-removelegacytests

Disable legacy encryption tests
[tx-robot] updated from transifex
The file providing the sftp:// scheme needs to be included manually.
Add short description explaining how SFTP ext storage class works.
[tx-robot] updated from transifex
Merge pull request #9563 from owncloud/version-delete-cache

Remove deleted versions from the cache
[tx-robot] updated from transifex
Merge pull request #9571 from owncloud/fix_appstore_update_issue

Fix update to button issue
Merge pull request #9605 from owncloud/sftp-missing-streamwrapper

Re-add missing sftp:// stream wrapper