Fix cbuildbot_commands_unittest broken by CL:196720.
Fix cbuildbot_commands_unittest broken by CL:196720.

BUG=none
TEST=Run the unit test.

Change-Id: Id0a81f2085f33f223a36ad8cd9b03a9aafbc30c1
Reviewed-on: https://chromium-review.googlesource.com/196898
Reviewed-by: Yu-Ju Hong <52dc720c411f8e2156e608c1a8b894a917489667@chromium.org>
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

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