Only keep the aufs testing case

Signed-off-by: fupan <[email protected]>

Author: lifupan

.travis.yml

@@ -9,10 +9,10 @@ go:
 
 env:
   - HYPER_EXEC_DRIVER=qemu    HYPER_STORAGE_DRIVER=aufs
-  - HYPER_EXEC_DRIVER=qemu    HYPER_STORAGE_DRIVER=rawblock
-  - HYPER_EXEC_DRIVER=libvirt HYPER_STORAGE_DRIVER=overlay
-  - HYPER_EXEC_DRIVER=libvirt HYPER_STORAGE_DRIVER=rawblock
-  - HYPER_EXEC_DRIVER=libvirt HYPER_STORAGE_DRIVER=btrfs
+#  - HYPER_EXEC_DRIVER=qemu    HYPER_STORAGE_DRIVER=rawblock
+#  - HYPER_EXEC_DRIVER=libvirt HYPER_STORAGE_DRIVER=overlay
+#  - HYPER_EXEC_DRIVER=libvirt HYPER_STORAGE_DRIVER=rawblock
+#  - HYPER_EXEC_DRIVER=libvirt HYPER_STORAGE_DRIVER=btrfs
 
 before_install:
   - sudo apt-get update -qq