Moved env creation in ProductWikiTestCase from __init__ to setUp.

Config in product environments is stored in database and should be
part of the setUp method. This replaces the quickfix introduced in
r1486610.


git-svn-id: https://svn.apache.org/repos/asf/bloodhound/trunk@1486635 13f79535-47bb-0310-9956-ffa450edef68