Use ForumService to create a forum topic.
Sample no longer needs a community id, give a help link to community
forums
Add a forum to the base community test. Helps with testing forum things.
Verify that the snippet works
Create a forum topic before we get the list of forum topics. Test the
result.
Community Uuid doesn't matter, only the forum id.
Update mock files
Merge pull request #1327 from fmoloney/CommunityForumTopics

Fix the creation of community forum topics.