2.2.0-rc1

• Upgrade Buildroot to 2016.08-rc1
  • busybox 1.25.0
  • dhcpcd 6.11.1
  • docker 1.10.3
  • e2fsprogs 1.43.1
  • gcc 4.9.4
  • glibc 2.23
  • logrotate 3.9.2
  • ntp 4.2.8p8
  • openssh 7.3p1
  • tzdata 2016f
  • wget 1.18
• Upgrade kernel to v4.6.5