RFR: 8251155: HostIdentifier fails to canonicalize hostnames starting with digits

[jiefu(傅杰)]

Hi all,

JBS:    https://bugs.openjdk.java.net/browse/JDK-8251155
Webrev: http://cr.openjdk.java.net/~jiefu/8251155/webrev.00/

HostIdentifier fails to canonicalize hostname:port if the hostname starts with digits.
The current implementation will get "scheme = hostname".
But the scheme should not be started with digits, which leads to this bug.

Thanks a lot.
Best regards,
Jie
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