Add standalone tornado repo.

This is the patched tornado from vendor/google/catawampus, with all its
history. Making it a standalone project so other apps can depend on it.

Change-Id: I1d67a19276fc69f8a6e216f6be9534548e5fc9ad
diff --git a/default_unrestricted.xml b/default_unrestricted.xml
index ea8c0dd..1a8b462 100644
--- a/default_unrestricted.xml
+++ b/default_unrestricted.xml
@@ -101,6 +101,7 @@
   <project name="vendor/opensource/projectM"/>
   <project name="vendor/opensource/tarballs"/>
   <project name="vendor/opensource/toolbox" path="toolbox-for-linux"/>
+  <project name="vendor/opensource/tornado"/>
   <project name="vendor/opensource/webrtc"/>
   <project name="vendor/qualcomm/drivers"/>
   <project name="vendor/qualcomm/switch"/>