[RocksDB] Improve manifest dump to print internal keys in hex for version edits.
Summary: Currently, VersionEdit::DebugString always display internal keys in the original ascii format. This could cause manifest dump to be truncated if internal keys contain special charactors (like null). Also added an option --input_key_hex for ldb idump to indicate that the passed in user keys are in hex. Test Plan: run ldb manifest_dump Reviewers: dhruba, emayanke CC: leveldb Differential Revision: https://reviews.facebook.net/D12111
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