[QA] extract in ownCloud external SFTP storage dos not update filecache table

[jnweiger]

Seen with ownCloud 10.15.0-rc.1 and extract-1.3.7

• extracting a zip file in normal primary storage works fine. OK
• extracting a zip file in an external storage SFTP:
  • the contents is extracted in the SFTP storage. OK
  • the database table filecache is not updated. Users don't see the extracted contents. BAD.

Workaround:

• admin runs occ file:scan --all - then the extrated content is visible to users.