JDK RFR of 8054720: Modifications of I/O methods for instrumentation purposes

JDK 9 reviewers: I would like to request the review of this patch to address the indicated issue: Issue: https://bugs.openjdk.java.net/browse/JDK-8054720 Patch: http://cr.openjdk.java.net/~bpb/8054720/ This changes passes the jdk_io and jdk_net tests on all platforms. Thanks, Brian