Revises sampler build dependency to use travis container infra
Revises sampler build dependency to use travis container infra

zifeishan/deepdive,sky-xu/deepdive,shahin/deepdive,HazyResearch/deepdive,zifeishan/deepdive,HazyResearch/deepdive,HazyResearch/deepdive,zifeishan/deepdive,HazyResearch/deepdive,sky-xu/deepdive,zifeishan/deepdive,shahin/deepdive,zifeishan/deepdive