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/130-hprof/src/Main.java b/test/130-hprof/src/Main.java
index 5899dd1..a8597f1 100644
--- a/test/130-hprof/src/Main.java
+++ b/test/130-hprof/src/Main.java
@@ -140,7 +140,7 @@
             allocator.join();
             dumper.join();
         } catch (InterruptedException e) {
-            System.err.println("join interrupted");
+            System.out.println("join interrupted");
         }
     }
 
@@ -178,7 +178,7 @@
         try {
             Thread.sleep(ms);
         } catch (InterruptedException e) {
-            System.err.println("sleep interrupted");
+            System.out.println("sleep interrupted");
         }
     }
 
@@ -223,7 +223,7 @@
         try {
             meth = vmdClass.getMethod("dumpHprofData", String.class);
         } catch (NoSuchMethodException nsme) {
-            System.err.println("Found VMDebug but not dumpHprofData method");
+            System.out.println("Found VMDebug but not dumpHprofData method");
             return null;
         }