[9] RFR: 8054380: X.509 cert extension SubjectAltName should allow digits as first character of dNSName

[Jason Uh]

Please review this fix, which allows the first character of a DNSName in 
a SubjectAltName to be either a letter or a digit.

http://cr.openjdk.java.net/~juh/8054380/webrev.01/
This change is to stay compliant with RFC 1123:

RFC 1123, Section 2.1:
 One aspect of host name syntax is hereby changed: the
      restriction on the first character is relaxed to allow either a
      letter or a digit.  Host software MUST support this more liberal
      syntax.

Please note this only applies to the first character of the hostname, 
not the first character of each component in the DNS Name. Given the 
grammar defined in RFC 952:

  <official hostname> ::= <hname>
  <hname> ::= <name>*["."<name>]
  <name>  ::= <let>[*[<let-or-digit-or-hyphen>]<let-or-digit>]

That is all that is allowed by the above update in
RFC 1123.

Thanks,
Jason