search for: max_system_uid

Hello, I did a quick change to the patched port of poppassd and am wondering if you think my code would introduce any potential problems. The idea is right after we check if the username exists, also check if the UID of that username is over 1000. I wanted to make sure that no one monkeys around with priveleged users once poppassd is running. So, the middle chunk of code is mine, everything