RFR: JDK-8031445: Attach on windows can fail with java.io.IOException: All pipe instances are busy

[gary.adams at oracle.com]

The IOException that is observed when creating a new named pipe
when the pipe already exists and is in use, recommends to retry
the operation later. Since we are already using a random number
to generate a unique pipe name, it makes sense to simply
retry the operation with a new pipe name.

Here is a proposed fix. Testing in progress.

   Issue: https://bugs.openjdk.java.net/browse/JDK-8031445
   Webrev: http://cr.openjdk.java.net/~gadams/8031445/