Update exclusion of registry to include Server 2012R2 (#253)
* Switch to registry based verification
Except for Server 2008 which doesn't use registry to store status, this will resolve issues with attempting to activate windows when English is not the system display language.
* Consolidate to a single guaranteed return
More optimal given a single guaranteed return
* Update catch behavior for failed license lookup
Log the message rather than set $active which is already false
* Update note on Server version
Reflect previous change
