Test Identity Trading

[andyl]

• test GroupCmd::Create && Event::GroupCreated
• test GroupCmd::Delete && Event::GroupDeleted
• test GroupCmd::AddMember && Event::GroupMemberAdded
• test GroupCmd::DeleteMember && Event::GroupMemberDeleted
• stm_trader_id matches to user_uuid
• stm_group_id matches to group membership
• update SQL for trader matching
• update SQL for group matching