Fix failing tests for public webDAV API step

[dpakach]

Fix for failing tests in drone due to core code change.
https://drone.owncloud.com/owncloud/files_antivirus/972/21/12

Also add new scenarios for new public webDAV API

[phil-davis]

Now there is just an Oracle fail: https://drone.owncloud.com/owncloud/files_antivirus/975/25/8

+ cd /var/www/owncloud/server
+ php occ a:l
An unhandled exception has been thrown:
Error: Cannot declare self-referencing constant 'Doctrine\DBAL\Driver\OCI8\OCI_COMMIT_ON_SUCCESS' in /var/www/owncloud/server/lib/composer/doctrine/dbal/lib/Doctrine/DBAL/Driver/OCI8/Driver.php:39

???

Update: all CI with Oracle is broken by an owncloudci/php docker image update. So we need to wait for that to be fixed.

[phil-davis]

The Oracle CI problem has been fixed. I restarted drone CI - let's see.

[codecov]

Codecov Report

Merging #335 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #335   +/-   ##
=========================================
  Coverage     58.36%   58.36%           
  Complexity      277      277           
=========================================
  Files            35       35           
  Lines          1244     1244           
=========================================
  Hits            726      726           
  Misses          518      518

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