Port folder renaming changes from AOM

Manually cherry-picked commits:
ceef058 libvpx->libaom part2
3d26d91 libvpx -> libaom
cfea7dd vp10/ -> av1/
3a8eff7 Fix a build issue for a test
bf4202e Rename vpx to aom

Change-Id: I1b0eb5a40796e3aaf41c58984b4229a439a597dc
diff --git a/test/avg_test.cc b/test/avg_test.cc
index 4a5d325..eb3e8b1 100644
--- a/test/avg_test.cc
+++ b/test/avg_test.cc
@@ -21,9 +21,9 @@
 #include "test/clear_system_state.h"
 #include "test/register_state_check.h"
 #include "test/util.h"
-#include "vpx_mem/vpx_mem.h"
+#include "aom_mem/vpx_mem.h"
 
-using libvpx_test::ACMRandom;
+using libaom_test::ACMRandom;
 
 namespace {
 class AverageTestBase : public ::testing::Test {
@@ -40,7 +40,7 @@
     source_data_ = NULL;
   }
 
-  virtual void TearDown() { libvpx_test::ClearSystemState(); }
+  virtual void TearDown() { libaom_test::ClearSystemState(); }
 
  protected:
   // Handle blocks up to 4 blocks 64x64 with stride up to 128
@@ -199,7 +199,7 @@
   }
 
   virtual void TearDown() {
-    libvpx_test::ClearSystemState();
+    libaom_test::ClearSystemState();
     vpx_free(src_);
   }