[jdk9] RFR: 8164366: ZoneOffset.ofHoursMinutesSeconds() does not reject invalid input

[Ivan Gerasimov]

Hello everybody!

The factory methods of ZoneOffset class demonstrate a minor inconsistency.
Normally, invalid values of arguments are rejected (e.g. when minutes > 
59), but the value of Integer.MIN_VALUE is allowed to be passed in.

This is due to using Math.abs(), which cannot handle Integer.MIN_VALUE well.

Would you please help review the fix?

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8164366
WEBREV: http://cr.openjdk.java.net/~igerasim/8164366/00/webrev/

With kind regards,
Ivan