Add stout and parrot to BVT.
Add stout and parrot to BVT.

Stout with only 3 devices for now.

TEST=cbuildbot_config_unittest.py
BUG=None

Change-Id: Iee8ca0479d74742ff314312b49045c4321ab3bdb
Reviewed-on: https://gerrit.chromium.org/gerrit/36063
Tested-by: Scott Zawalski <d0bc454f32175e2361d26fbdb5930ff6be11acc5@chromium.org>
Reviewed-by: John D Hong <010a484eb63152b850d4d67ce0d167ec485a246f@chromium.org>
Commit-Ready: Scott Zawalski <d0bc454f32175e2361d26fbdb5930ff6be11acc5@chromium.org>
Reviewed-by: Scott Zawalski <d0bc454f32175e2361d26fbdb5930ff6be11acc5@chromium.org>

coreos/chromite,zhang0137/chromite,zhang0137/chromite,zhang0137/chromite,chadversary/chromiumos.chromite,coreos/chromite,chadversary/chromiumos.chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite