PostgreSQL: Fix tests in views_ui test group

This issue is part of #2157455: [Meta] Make Drupal 8 work with PostgreSQL or remove support from core before release.

Currently there is one or more fail or exception in the views_ui test group identified by the new docker based testbot that need to be fixed to make PostgreSQL finally passing all tests. For install instructions of the new docker based testbot, please klick here (there is also a bootable USB/CDROM ISO available for instant access). To help identify the problems within the test group views_ui, please use the following command and attach the output to this issue.

sudo DCI_DBTYPE='pgsql' \
DCI_DBVER='9.1' \
DCI_PHPVERSION='5.5' \
DCI_CONCURRENCY='4' \
DCI_TESTGROUPS='views_ui' \
DCI_DRUPALBRANCH='8.0.x' \
DCI_VERBOSE='true' \
DCI_UPDATEREPO='true' \
./containers/web/run.sh

As an alternative you may want to run tests from within Drupal8 using the Testing module, but results may vary and docker testbots results are preferred, thanks!