peer: mruInventoryMap and mruNonceMap implement LRU caches, not MRU

[jrick]

We do want the LRU behavior, so this just requires some file renames and fixing the identifier names and comments.

[davecgh]

I agree that they are LRU caches, but the MRU is referring to the maps themselves containing the most recently used entries.

If they were named mruIventoryCache and mruNonceCache, it would be wrong, but that isn't what they're named.

[davecgh]

To follow up, I don't have any particular objections to them being renamed to lruInventoryCache and lruNonceCache if people think it would avoid confusion, so long as all of the comments and file names are updated accordingly. The only thing I would say there is it seems like a lot of churn for little benefit.

[randomshinichi]

May I do this? That's assuming you still want this... I'm new to the codebase and I think this might take me on a nice tour.

[davecgh]

As discussed in dev channel, @randomshinichi will be taking this.