Add RateLimiter config property to enable limiting on specific nodes

[hiteshk25]

1. Added ratelimiter config property nodesEnabled
2. App can set comma separated list of solr nodes to enable ratelimiter on those nodes only. Example "nodesEnabled": "localhost"

[magibney]

This should work, though I'd prefer to consider this a temporary change, to be reverted and re-approached for, and backported from, upstream.

My only suggestion is not functional: I don't like overrideNodeProperty() as a method name; it's very opaque. Perhaps: maybeEnableForHost(String hostname)?

[magibney]

This looks good now I think (again, provisionally, with the expectation that we'll revert and pursue similar upstream).

I edited the issue title to be more descriptive.

[magibney]

there's no reason not to have these all as one if clause. Fine this way too, just a little unusual.

[hiteshk25]

This looks good now I think (again, provisionally, with the expectation that we'll revert and pursue similar upstream).

I edited the issue title to be more descriptive.

Definitely, that should part of whole pluggable architecture proposal.