nvm environment fixes
nvm environment fixes

* `node_version` variable should start with a `v`.
* Fix the permissions on `/etc/profile.d/nvm_dir.sh`.
* Rename the scripts in `/etc/profile.d` so that they are loaded in the right order.
* Define the given version of node as default version.

tokyowizard/ansible-statsd,AerisCloud/ansible-statsd