RFR(s): 8027810 RMI CheckUsage tests should be deleted

[Stuart Marks]

Hi all,

There are a couple of RMI tests that do nothing except check the usage message 
emitted by the 'rmiregistry' and 'rmid' commands when given invalid command-line 
options. Since two bugs have occurred in these tests, I have determined that the 
overhead of maintaining these tests outweighs their usefulness, and I'm 
therefore removing them.

Bug:

     https://bugs.openjdk.java.net/browse/jdk-8027810

Webrev:

     http://cr.openjdk.java.net/~smarks/reviews/8027810/webrev.0/

Thanks,

s'marks