updata testbed playbook for ubuntu 17.04#216

Merged

lguohan merged 2 commits intosonic-net:masterfrom

lguohan:githubmaster

Jul 25, 2017

Commits on Jul 24, 2017

updata testbed playbook for ubuntu 17.04
Guohan Lu
committed

Commits on Jul 25, 2017

change fact cache time to 600 seconds, add comments on kernel
Guohan Lu
committed