JDK10 RFR: 8165437 Evaluate the use of gettimeofday in Networking code

[Vyom Tewari]

Hi,

Please review the code change for below issue.
Bug:       https://bugs.openjdk.java.net/browse/JDK-8165437

Webrev: http://cr.openjdk.java.net/~vtewari/8165437/webrev0.5/index.html

This change will replace the "gettimeofday" to use the monotonic 
increasing clock(i used the existing function "JVM_NanoTime" instead of 
writing my own).

Thanks,

Vyom