RFR(XS): 8169003: LogDecorations.iso8601_utctime_test fails if numeric locale uses ", " as separator between integer and fraction part

[Kirill Zhaldybin]

Dear all,

Could you please review this fix for 8169003?

I changed parsing of time string so now it is not depend on LC_NUMERIC 
locale so the test does not fail if locale where "floating point" is 
actually a comma is set.

WebRev: http://cr.openjdk.java.net/~kzhaldyb/webrevs/JDK-8169003/webrev.00/
CR: https://bugs.openjdk.java.net/browse/JDK-8169003

Thank you.

Regards, Kirill