BPI-M2 new image: Ubuntu_docker_K4.2_beta V4.0

BPI-M2 new image: Ubuntu_docker_K4.2_beat V4.0

https://drive.google.com/file/d/0BzoTh3Vdt47fZ3RScjBneGlaNlE/view?usp=sharing

Release Note: 1,Support BPI-M2 2,uboot : 2015-7 3,linux kernel: 4.2. 4,ethernet work fine 5,WIFI driver work fine 6,user name/pass: pi/bananapi 7,this is just a test version.