Fix core acceptance test groups mismatch

[phil-davis]

Last night's user_ldap CI failed with:
https://drone.owncloud.com/owncloud/user_ldap/1635/1271

--- Failed scenarios:

    /var/www/owncloud/server/tests/acceptance/features/apiShareManagementBasic/createShare.feature:1057
    /var/www/owncloud/server/tests/acceptance/features/apiShareManagementBasic/createShare.feature:1058
    /var/www/owncloud/server/tests/acceptance/features/apiShareManagementBasic/createShare.feature:1090
    /var/www/owncloud/server/tests/acceptance/features/apiShareManagementBasic/createShare.feature:1091

120 scenarios (116 passed, 4 failed)
1303 steps (1291 passed, 4 failed, 8 skipped)

Those are new scenarios. They do not have the "correct" combinations of group membership to match what is used in user_ldap

Fix it for now, then think about issue #250 and how we can make this better for the future.

[phil-davis]

This particular one has been fixed. Issue #250 can stay open to sort this out better some day.