[TESTBUG] The test com/sun/corba/cachedSocket/7056731.sh should not be run on JRE

The test com/sun/corba/cachedSocket/7056731.sh requires jdb which is not available in JRE. Therefore the test shall be excluded from execution on JRE.

Here's a snippet from the test:

(sleep 2;
echo "stop in com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.unregisterWaiter";
sleep 2;
echo "run";
sleep 2;
echo "cont";
sleep 2;
echo "cont";
sleep 2;
echo "cont";
sleep 2;
echo "suspend 1";
sleep 2;
kill -9 $SERVER_PROC;
sleep 2;
echo "cont";
sleep 2;
echo "thread 1"
sleep 2;
echo "clear com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.unregisterWaiter"
sleep 2;
echo "resume 1";
)| ${TESTJAVA}${FS}bin${FS}jdb -connect com.sun.jdi.SocketAttach:hostname=localhost,port=8000

The command 'kill -9 $SERVER_PROC' has no chance to be called because jdb is not available. This results in jtreg's failure and a resource leak.