RFR: 8225499: InetSocketAddress::toString not friendly to IPv6 literal addresses

[Julia Boes]

Hi,

This fix improves the handling of IPv6 addresses in 
InetSocketAddress::toString. The implementation now encloses the IPv6 
literal in brackets, which wasn't done previously.

Example:

new InetSocketAddress("::1", 80).toString()
before: /0:0:0:0:0:0:0:1:80
after: /[0:0:0:0:0:0:0:1]:80

Additionally, the string format for unresolved addresses is changed to 
'hostname/<unresolved>:80' to closer adhere to the format of 
'hostname/IP literal:port'.

Example:

InetSocketAddress.createUnresolved("foo", 80).toString()
before: foo:80
after: foo/<unresolved>:80

Bug: https://bugs.openjdk.java.net/browse/JDK-8225499

Webrev: http://cr.openjdk.java.net/~jboes/webrevs/8225499/webrev.00/

CSR: https://bugs.openjdk.java.net/browse/JDK-8232002


Regards,

Julia