Some failing tests with Webdav custom properties

[PVince81]

    /srv/www/htdocs/owncloud/tests/acceptance/features/apiWebdavProperties/getFileProperties.feature:289
    /srv/www/htdocs/owncloud/tests/acceptance/features/apiWebdavProperties/getFileProperties.feature:309
    /srv/www/htdocs/owncloud/tests/acceptance/features/apiWebdavProperties/setFileProperties.feature:32
    /srv/www/htdocs/owncloud/tests/acceptance/features/apiWebdavProperties/setFileProperties.feature:33
    /srv/www/htdocs/owncloud/tests/acceptance/features/apiWebdavProperties/setFileProperties.feature:62
    /srv/www/htdocs/owncloud/tests/acceptance/features/apiWebdavProperties/setFileProperties.feature:63

Need to check if it's the tests themselves or if there are further issues.

Please note that the Litmus tests for properties do pass.

[refs]

Update: with the recent changes to the test suite, these are now documented here