Add own images in list_images. Filter HVM instances.
Add own images in list_images. Filter HVM instances.

Include the user's images (amis).
In addition, we need to filter HVM images because linux instances do not
seem to work correctly.

kelonye/mist.io,zBMNForks/mist.io,johnnyWalnut/mist.io,afivos/mist.io,kelonye/mist.io,DimensionDataCBUSydney/mist.io,munkiat/mist.io,Lao-liu/mist.io,kelonye/mist.io,DimensionDataCBUSydney/mist.io,afivos/mist.io,DimensionDataCBUSydney/mist.io,afivos/mist.io,johnnyWalnut/mist.io,zBMNForks/mist.io,Lao-liu/mist.io,munkiat/mist.io,munkiat/mist.io,zBMNForks/mist.io,Lao-liu/mist.io,munkiat/mist.io,johnnyWalnut/mist.io,DimensionDataCBUSydney/mist.io,Lao-liu/mist.io