pop3: fix tests to not hang if openssl is not installed
pop3: fix tests to not hang if openssl is not installed

factor/factor,mrjbq7/factor,bpollack/factor,slavapestov/factor,nicolas-p/factor,nicolas-p/factor,bjourne/factor,slavapestov/factor,bjourne/factor,nicolas-p/factor,slavapestov/factor,AlexIljin/factor,AlexIljin/factor,dch/factor,slavapestov/factor,slavapestov/factor,tgunr/factor,nicolas-p/factor,tgunr/factor,dch/factor,factor/factor,bpollack/factor,slavapestov/factor,factor/factor,bjourne/factor,tgunr/factor,sarvex/factor-lang,mrjbq7/factor,bjourne/factor,dch/factor,bpollack/factor,sarvex/factor-lang,AlexIljin/factor,dch/factor,mrjbq7/factor,factor/factor,AlexIljin/factor,tgunr/factor,AlexIljin/factor,factor/factor,mrjbq7/factor,sarvex/factor-lang,bpollack/factor,tgunr/factor,sarvex/factor-lang,tgunr/factor,bpollack/factor,AlexIljin/factor,sarvex/factor-lang,sarvex/factor-lang,AlexIljin/factor,bpollack/factor,nicolas-p/factor,bjourne/factor,dch/factor,bjourne/factor,dch/factor,bjourne/factor,bpollack/factor,factor/factor,mrjbq7/factor,nicolas-p/factor,mrjbq7/factor,sarvex/factor-lang,nicolas-p/factor,slavapestov/factor