examples/ubuntu: make prerequisites noninteractive

Change-Id: I594caf18c30c33a5bd94b092d407740a4bdfe660
Reviewed-on: https://weave-review.googlesource.com/1092
Reviewed-by: Vitaly Buka <vitalybuka@google.com>
1 file changed
tree: 30ee0d2ea224d4c0717c6a31bba813591e1c614a
  1. libweave/