cipd: also support wget as fetch command
cipd: also support wget as fetch command

On Debian's default install curl is not available, but wget is.

Bug: 762568
Change-Id: Ibc8c52676fd5e37ef1b9f1ffc061b2be27ec80c4
Reviewed-on: https://chromium-review.googlesource.com/653517
Reviewed-by: Daniel Jacques <8400006a9338a0893dca0101ad49838955bd6b2c@chromium.org>
Commit-Queue: Paweł Hajdan Jr. <84cab74a96a175cf90ed68b8abab420352923e11@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools