ART: Make run-tests more verbose

Make run-tests log ERROR level on host. Adjust some internal LOG(ERROR)
to LOG(WARNING). Add check scripts to adjust for other LOG(ERROR)
messages.

Bug: 18713034
Change-Id: I2a3e055baa6a0e31f106364c300c20963a59ed94
diff --git a/runtime/native/java_lang_Runtime.cc b/runtime/native/java_lang_Runtime.cc
index dc0cb7b..97b17bf 100644
--- a/runtime/native/java_lang_Runtime.cc
+++ b/runtime/native/java_lang_Runtime.cc
@@ -65,7 +65,7 @@
       Fn android_update_LD_LIBRARY_PATH = reinterpret_cast<Fn>(sym);
       (*android_update_LD_LIBRARY_PATH)(ldLibraryPath.c_str());
     } else {
-      LOG(ERROR) << "android_update_LD_LIBRARY_PATH not found; .so dependencies will not work!";
+      LOG(WARNING) << "android_update_LD_LIBRARY_PATH not found; .so dependencies will not work!";
     }
   }