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/vp10_convolve_optimz_test.cc b/test/vp10_convolve_optimz_test.cc
index 2235088..cb8b8fb 100644
--- a/test/vp10_convolve_optimz_test.cc
+++ b/test/vp10_convolve_optimz_test.cc
@@ -19,7 +19,7 @@
 namespace {
 
 using std::tr1::tuple;
-using libvpx_test::ACMRandom;
+using libaom_test::ACMRandom;
 
 typedef void (*conv_filter_t)(const uint8_t *, int, uint8_t *, int, int, int,
                               const InterpFilterParams, const int, int, int);
@@ -79,7 +79,7 @@
 
   virtual void TearDown() {
     delete[] alloc_;
-    libvpx_test::ClearSystemState();
+    libaom_test::ClearSystemState();
   }
 
  protected:
@@ -255,7 +255,7 @@
 
   virtual void TearDown() {
     delete[] alloc_;
-    libvpx_test::ClearSystemState();
+    libaom_test::ClearSystemState();
   }
 
  protected: