[MERGE] LRUCache._remove_node fix

[John Arbash Meinel]

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It seems that the new LRUCache code was missing a step when removing an
old node. We were removing the node from the dict, so it wouldn't be
found, and we were removing its 'value', so we were freeing some memory,
but we weren't removing the node from the linked list. We also wouldn't
be removing the 'key', so that tuple and the strings would still be
hanging around.

The patch is pretty simple, and the test does cover it.

John
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