bump yeti

git shortlog src/tests fe899e..25e1d9
Dmitriy Kalinin and Jesse Zhang (2):
      make sure we fail if any command inside update fails
      split out update script into update and update_env script so that ci can prep the env but not pull git

Change-Id: I3ebab01da887a176995b45b7e9f5b93a53fb067e
git shortlog fe899eb..ac65a56
Dmitriy Kalinin and Jesse Zhang (2):
      make sure we fail if any command inside update fails
      split out update script into update and update_env script so
      that ci can prep the env but not pull git

Ryan Tang and Tim Labeeuw (1):
      Fix the gemfile to point to the new vmc plugin
      locations
Merge git://github.com/cloudfoundry/cf-release