jenkins_worker: Add pre-populated .nmprc file to jenkins home dir.

@jzoldak @hkim823 @clytwynec 

This is the companion piece to https://github.com/edx/edx-platform/pull/4828. The npm profile should be on the worker already, and when the get registry call is made, the set registry call (which would result in errno 50) is unnecessary and therefore avoided.


Oh that's interesting. Mine doesn't have spaces. What distro are you testing on? Perhaps we should discuss...