Label naming style inconsistent

[TimZaman]

Nit: the labels dash/underscore are inconsistent. This hurts my inner-zen 🏯 .

Labels:
pytorch-replica-index=0
pytorch-replica-type=master
pytorch_job_name=job2-optimizer
pytorch_job_role=master

[johnugeorge]

@richardsliu Should we target this in 0.5.0? It has to be fixed in tf-operator too

[richardsliu]

We should, seems like a simple fix. Inner zen is important.

[johnugeorge]

/area 0.5.0