Added message to inform that step may take a while

Change-Id: I8f609fb34a7c7c3db85cfaf06a810f290ac5a026
Reviewed-on: https://weave-review.googlesource.com/1072
Reviewed-by: Vitaly Buka <vitalybuka@google.com>
1 file changed
tree: e70c45ebac4d43b09041136ba1ea0f9b4e06d4e9
  1. libweave/