RFR: 8005068 - HttpCookie does not correctly handle negative maxAge values

[Rob McKenna]

Hi folks,

Simple enough change here. As per the description HttpCookie.setMaxAge 
will set any arbitrary negative value, while we only check for 
MAX_AGE_UNSPECIFIED to determine whether a cookies max age has been 
specified or not. This fix sets maxAge to MAX_AGE_UNSPECIFIED if the 
setMaxAge(expiry) parameter is < 0.

In addition to that HttpCookie.parse(header) incorrectly sets the maxAge 
to a negative value if the expires attribute is in the past. This 
effectively means it is unspecified instead of expired. This fix sets 
such maxAge values to 0 (expire immediately) instead.

https://bugs.openjdk.java.net/browse/JDK-8005068
http://cr.openjdk.java.net/~robm/8005068/webrev.01/

     -Rob