failure? is not a thing. Changed sha_does_not_include_latest_master to use success? instead.
failure? is not a thing. Changed sha_does_not_include_latest_master to
use success? instead.

[#101427062](https://www.pivotaltracker.com/story/show/101427062)

Signed-off-by: Corey Innis <c6de6a297c7ba72017894924528d266f693d3f31@pivotal.io>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh