fix unit tests of mdb2scheamreader
Merge pull request #12342 from owncloud/fix-master-unit-tests

fix unit tests of mdb2scheamreader
new folder structure for keys
all keys are now in files_encryption/key/path_to_file/filename/
share keys are named: user.shareKey
file key is named: fileKey
harmonize copyright notice
change private/public key names for consistency reasons
upgrade to new folder structure