network-usage-by-node stats need to monitor en* interfaces

[zmc]

On a fresh production-mode cluster:

The interfaces are eno1 and eno2

[pcuzner]

This is just the query - it was set to ethX and bondX. I've included enX now. @zmc are there any other prefixes I should whitelist - I have to whitelist, since I want to avoid the lo interface and the query doesn't support exclude :(

[zmc]

Ah, great! @djgalloway - are there any other common interface prefixes we should be aware of?

[djgalloway]

@zmc Does enX cover enpXsX? Gotta keep in mind systemd's new naming scheme.

[pcuzner]

@djgalloway yeah - the query is actually using {en,eth,bond}*

@zmc the updated dashboard is in PR #48

[djgalloway]

@pcuzner if anyone's running RHEL or CentOS 6, there's a possibility the NIC could be named em* too.

[zmc]

No EL6 support ATM; we're resolved here