Roll luci-go/isolate.

It brings auth support (so developers can use 'isolate' if they really want to)
and adds *.pyc to default isolate blacklist.

Built here:
https://build.chromium.org/p/chromium.infra/builders/infra-continuous-mac-10.10-64/builds/673
https://build.chromium.org/p/chromium.infra/builders/infra-continuous-precise-64/builds/1655
https://build.chromium.org/p/chromium.infra/builders/infra-continuous-win-64/builds/1460

R=maruel@chromium.org, stip@chromium.org
BUG=584073

Review URL: https://codereview.chromium.org/1671753002

Cr-Original-Commit-Position: refs/heads/master@{#373730}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 792af7ebd374b815b01d2dd0a1e38fdf55c1e370
3 files changed