buffet: Implicitly define minimalRole in command definition file

Buffet still set minimalRole to 'user' even if value is omitted.

BUG=brillo:808
TEST=`FEATURES=test emerge-gizmo buffet`

Change-Id: I8d0ca7a2b38fd265a0f4ac468ed8ee3e0550a09f
Reviewed-on: https://chromium-review.googlesource.com/274233
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
1 file changed
tree: 8b62fd319069fce31ca5013d2bc77f70d3ef7fce
  1. buffet/