Use a tagged version of the Shared Pipeline API. (#357)
Use a tagged version of the Shared Pipeline API. (#357)

This will prevent changes in the libraries from breaking the builds.
jmuk/mixer,xiaolanz/mixer,guptasu/mixer,jmuk/mixer,ZackButcher/mixer,xiaolanz/mixer,guptasu/mixer,jmuk/mixer,istio/old_mixer_repo,istio/old_mixer_repo,ZackButcher/mixer,douglas-reid/mixer,douglas-reid/mixer,istio/old_mixer_repo,rkpagadala/mixer,rkpagadala/mixer,douglas-reid/mixer,xiaolanz/mixer,rkpagadala/mixer,ZackButcher/mixer,guptasu/mixer