[RocksDB] Support internal key/value dump for ldb
Summary: This diff added a command 'idump' to ldb tool, which dumps the internal key/value pairs. It could be useful for diagnosis and estimating the per user key 'overhead'. Also cleaned up the ldb code a bit where I touched. Test Plan: make check; ldb idump Reviewers: emayanke, sheki, dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D11517
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