Normalize IPv6 address as per https://www.ietf.org/rfc/rfc2732.txt
@param host A host name @return Host name surrounded by '[' and ']' as needed.
See Implementation
Normalize IPv6 address as per https://www.ietf.org/rfc/rfc2732.txt
@param host A host name @return Host name surrounded by '[' and ']' as needed.