Replace clouddevices with weave in documentation and tests
Removed OAuth scope parameter as optional.

BUG:25627281

Change-Id: I1b2bce5b86fd7a0be89c446b5a13cc9c49244992
Reviewed-on: https://weave-review.googlesource.com/1538
Reviewed-by: Alex Vakulenko <avakulenko@google.com>
(cherry picked from commit 88272d5b9e88dfd253c18aea4792fe57ee51696d)
Reviewed-on: https://weave-review.googlesource.com/1542
Reviewed-by: Vitaly Buka <vitalybuka@google.com>