Tests: never use System.err

Always print stack traces to System.out, and replace all
System.err.println()'s with System.out.println().

Follow-up of https://android-review.googlesource.com/#/c/187020/ and
https://android-review.googlesource.com/#/c/407032/.

Test: m test-art-host
      m test-art-target
Change-Id: I9ab9cd955a8db25b2ec6673790e5bc924f62c88a
diff --git a/test/802-deoptimization/src/DeoptimizationController.java b/test/802-deoptimization/src/DeoptimizationController.java
index d6e662d..88579de 100644
--- a/test/802-deoptimization/src/DeoptimizationController.java
+++ b/test/802-deoptimization/src/DeoptimizationController.java
@@ -50,7 +50,7 @@
         throw new IllegalStateException("Not tracing.");
       }
     } catch (Exception exc) {
-      exc.printStackTrace(System.err);
+      exc.printStackTrace(System.out);
     } finally {
       if (tempFile != null) {
         tempFile.delete();
@@ -65,7 +65,7 @@
         throw new IllegalStateException("Still tracing.");
       }
     } catch (Exception exc) {
-      exc.printStackTrace(System.err);
+      exc.printStackTrace(System.out);
     }
   }