Fix remote_try_unittest.py
Fix remote_try_unittest.py

Use cbuildbot parsing functions to generate fake options instead of
mock.

BUG=None
TEST=ran tests

Change-Id: I534d6b9d872600fda81a70462260e4c582a8189f
Reviewed-on: https://gerrit.chromium.org/gerrit/22177
Tested-by: Ryan Cui <5ce1592d53754a87a44fc2eb7b63d5f77cf50fdb@chromium.org>
Commit-Ready: Ryan Cui <5ce1592d53754a87a44fc2eb7b63d5f77cf50fdb@chromium.org>
Reviewed-by: Ryan Cui <5ce1592d53754a87a44fc2eb7b63d5f77cf50fdb@chromium.org>

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