fix container4nfv jenkins job hung issue

fix container4nfv jenkins job hung issue

1. fix cleanup: poweroff/delete all vms
2. add timeout for kubeadm init/join hung:
    https://github.com/kubernetes/kubernetes/issues/43800
3. try to fix kubeadm init/join hung

Change-Id: I133d5aafee0455848909484efee5548b2015473d
Signed-off-by: Guo Ruijing <ruijing.guo@intel.com>