Make sure everything has a justification.

And move a couple of items to the exclude file. If we ever get to a lower threshold, these will show up all over the place.

core/src/main/java/hudson/Proc.java

@@ -216,7 +216,7 @@ public abstract class Proc {
          * @param err
          *      null to redirect stderr to stdout.
          */
-        @SuppressFBWarnings("COMMAND_INJECTION")
+        @SuppressFBWarnings(value = "COMMAND_INJECTION", justification = "Command injection is the point of this old, barely used class.")
         public LocalProc(String[] cmd,String[] env,InputStream in,OutputStream out,OutputStream err,File workDir) throws IOException {
             this( calcName(cmd),
                   stderr(environment(new ProcessBuilder(cmd),env).directory(workDir), err==null || err== SELFPUMP_OUTPUT),