TEST_BUG: RMI CheckUsage tests should be deleted

There are a couple tests in the RMI test suite that simply check the usage message of the rmiregistry and rmid commands:

java/rmi/registry/checkusage/CheckUsage.java
java/rmi/activation/checkusage/CheckUsage.java

All these do is check that the usage message includes the -J option, for passing arguments to the JVM.

These tests are mostly useless and are in fact a maintenance burden. They have suffered from race conditions
in the past; see JDK-7187882 and possibly JDK-4211054.

In addition, the tests have problems when run in a non-US locale, since the strings
they search for are localized! See this email thread:

http://mail.openjdk.java.net/pipermail/i18n-dev/2013-October/001200.html

We would be better off simply removing these tests.