DNSService and DNSPointer equality check should be case insensitive

[J. Nick Koston]

The equality check and hash should use server_key and not server

python-zeroconf/src/zeroconf/_dns.py

Line 414 in 255a884

 self._hash = hash((self.key, type_, self.class_, priority, weight, port, server)) 

[J. Nick Koston]

The DNSPointer check is probably wrong as well.