fix memleak: free abstract layers at exit
fix memleak: free abstract layers at exit

nakijun/vtp,markraz/vtp,seanisom/vtp,seanisom/vtp,markraz/vtp,seanisom/vtp,nakijun/vtp,nakijun/vtp,seanisom/vtp,seanisom/vtp,nakijun/vtp,nakijun/vtp,markraz/vtp,markraz/vtp,markraz/vtp