Try to reduce contention between readers & writer in NodeDB #2
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Previously there was a single mutex that had to be acquired by a
reader/writer before they could access either the node cache or the
underlying DB. These changes introduce a second mutex to synchronize
access to the node cache, while the original mutex is now only used to
synchronize write access to the underlying DB.
Multiple readers may now access the underlying DB concurrently, this
should work with GoLevelDB at least since it supports concurrent readers.