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/916-obsolete-jit/src/Main.java b/test/916-obsolete-jit/src/Main.java
index 17a7a86..d7b32ba 100644
--- a/test/916-obsolete-jit/src/Main.java
+++ b/test/916-obsolete-jit/src/Main.java
@@ -132,7 +132,7 @@
           "sayHi", Runnable.class, Consumer.class);
     } catch (Exception e) {
       System.out.println("Unable to find methods!");
-      e.printStackTrace();
+      e.printStackTrace(System.out);
       return;
     }
     // Makes sure the stack is the way we want it for the test and does the redefinition. It will