RFR(xs): 8193846: Obsolete the VM option UseUTCFileTimestamp

[Calvin Cheung]

bug: https://bugs.openjdk.java.net/browse/JDK-8193846

CSR: https://bugs.openjdk.java.net/browse/JDK-8195797

webrev: http://cr.openjdk.java.net/~ccheung/8193846/webrev.00/

Sample output:

$ ./bin/java -XX:+UseUTCFileTimestamp -version
Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option 
UseUTCFileTimestamp; support was removed in 11.0
java version "11-internal" 2018-03-20
Java(TM) SE Runtime Environment 18.3 (slowdebug build 
11-internal+0-adhoc.cccheung.open)
Java HotSpot(TM) 64-Bit Server VM 18.3 (slowdebug build 
11-internal+0-adhoc.cccheung.open, mixed mode)

thanks,
Calvin