Update tensorflow-postsubmit.yml (#967)
Update tensorflow-postsubmit.yml (#967)

Remove `easy_install pip`, this step always fail and is not needed.
bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration