[Behat] Moved AdminUI features

[mnocon]

Question	Answer
Tickets	https://jira.ez.no/browse/EZP-30884
Bug fix?	yes
New feature?	no
BC breaks?	no
Tests pass?	yes
Doc needed?	no
License	GPL-2.0

The full regression builds are failing: https://travis-ci.com/ezsystems/ezplatform-page-builder/jobs/238853969

because it's not possible to separate from each other feature files from AdminUI: the "standard" ones and the new "personas"

Using definition like:

regression:
      suites:
          regression:
            paths:
              - '%paths.base%/vendor/ezsystems/ezplatform-admin-ui/features'

means that all feature files (both from "features" directory and "personas" subdirectory) will be taken into account, which causes the personas tests to be run as well.

I've decided to move the "standard" (running on admin) files to another directory, which allows us to separate them from others.

Companion PR:
https://github.com/ezsystems/ezplatform-page-builder/pull/395

Any names better than "standard" are more than welcome, coudn't find anything better 😉

Checklist:

• Coding standards ($ composer fix-cs)
• Ready for Code Review

[mnocon]

@lserwatka this one can be merged, together with:
https://github.com/ezsystems/ezplatform-page-builder/pull/395