Print the StackTrace to the client.

Other solutions like e.g. printing only the classname to the client or somesuch
end up printing out of order and even duplicate information when running
spectest, so this seems least weird.

src/vm/jvm/runtime/org/perl6/nqp/tools/EvalServer.java

@@ -168,10 +168,10 @@ public void run() {
                 } catch (ThreadDeath t) {
                     // swallowed exit
                 } catch (Throwable t) {
-                    System.setOut(orgOut);
-                    System.setErr(orgErr);
                     System.err.print("Error in socket connection:");
                     t.printStackTrace();
+                    System.setOut(orgOut);
+                    System.setErr(orgErr);
                 } finally {
                     System.setOut(orgOut);
                     System.setErr(orgErr);