RFR JDK-8212151: jdi/ExclusiveBind.java times out due to "bind failed: Address already in use" on Solaris-X64

[Alex Menkov]

Hi all,

jira: https://bugs.openjdk.java.net/browse/JDK-8212151
webrev: http://cr.openjdk.java.net/~amenkov/exclusiveBind/webrev/

The fix updates the test to allow debuggee to select available port 
instead of using error-prone "getFreePort" approach.

--alex