Code Review Request - Bug #6948101 & 7142596: RMI JPRT tests are failing

[Darryl Mocek]

Hello core-libs.  Please review this webrev to fix Bug #6948101 and 
#7142596.  This commit fixes concurrency issues with the RMI tests.

- Added TestLibrary.getUnusedRandomPort method.  This attempts to return 
a random port number, which is unused, between the port ranges 1024 and 
64000 (inclusive).  It will try up to 10 times before giving up.
- Changed almost all tests from using hard port numbers to using random 
port numbers for running the RMI Registry and RMID.
- Removed othervm from those tests which don't need it.
- Added parameters for tests which spawn a separate VM to pass RMI 
Registry and RMID ports in cases where needed.
- Added PropertyPermission to security policy files where needed.
- Removed java/rmi and sun/rmi from tests which cannot be run concurrently.
- Removed java/rmi and sun/rmi from tests which must run in othervm mode.
- Added java/rmi/Naming to list of tests which cannot be run concurrently.

Webrev, can be found here: 
http://cr.openjdk.java.net/~dmocek/7142596/webrev.00

Thanks,
Darryl