Fix Get-ForumThread

[afscrome]

Calling Get-ForumThread usually fails due to overlapping paramater set parameters, so powershell is unable to determine which set to actually use. This is because the forum thread endpoint is special in that the query type is defined by seperate routes /active.json, /unread.json as opposed to as query string params as used elsewhere.

It may be simplest to just exclude this from code generation, and handle it as a special case.

[afscrome]

Actually looks like there are some other endpoints with similar ambiguities - a few examples:

• *-CommunityFriendship
• *CommunityGroupuser
• Get-CommunityInfo

(You can see these ambiuities for any function in https://github.com/afscrome/SampleDataGenerator/blob/master/CommunityRest/Generated.ps1 where there are multiple ParmeterSets, and there are many parameters shared amongst all ParemeterSets w/out a key parameter which can be used to distinguish them.