Iss #635 - Add distinct filter to new user creation to reduce dupes

• Iss #635 (closed) - Add distinct filter to new user creation to reduce dupes

As part of the user creation process, we lookup users to see if an account already exists. This search is currently cached, which will mean some of the lookups will return empty from an initial scan when the account has already been created. To combat this, a call to clear the cache of user search results was added before this operation is done.