8370074: Remove unused code in AbstractDebuggeeTest.java

Reviewed-by: fandreuzzi, cjplummer, lmesnik

Author: albertnetymk

test/hotspot/jtreg/vmTestbase/nsk/share/jpda/AbstractDebuggeeTest.java

@@ -175,13 +175,6 @@ public void unloadTestClass(String className, boolean expectedUnloadingResult) {
         }
     }
 
-    static public void sleep1sec() {
-        try {
-            Thread.sleep(1000);
-        } catch (InterruptedException e) {
-        }
-    }
-
     private StateTestThread stateTestThread;
 
     public static final String COMMAND_QUIT = "quit";
@@ -354,9 +347,6 @@ public void forceGC() {
         eatMemory();
     }
 
-    public void voidValueMethod() {
-    }
-
     public void unexpectedException(Throwable t) {
         setSuccess(false);
         t.printStackTrace(log.getOutStream());