Merge branch 'developing' into 'master'

hikey960: mkdtimg: force to use python2

See merge request LinaroLtd/linaro-aosp/linaro-vendor-package!1
tree: c8754d7f315f9d1cd1618b64322125b5a61d1f23
  1. src/
  2. extract-linaro_devices.sh-source
  3. generate_vendor_package.sh