remote should not overwrite server_hostname

[MrQubo]

import ssl
from pwn import *

io = remote('172.22.0.2', 9090, ssl=True, ssl_args={ 'server_hostname': 'example.com' })
...

In the above code server_hostname will be overwritten with '172.22.0.2'.

[Arusekk]

You can change assignments to setdefault probably.

[MrQubo]

Should I create PR to dev or stable?

[MrQubo]

I think we should jest error if 'server_hostname' is set in ssl_args and sni is not False.