[RocksDB] Replace iterator based loop with range based loop for stl containers
Summary: As title. Code is shorter and cleaner See https://our.dev.facebook.com/intern/tasks/?t=2233981 Test Plan: make check Reviewers: dhruba, heyongqiang Reviewed By: dhruba CC: leveldb, zshao Differential Revision: https://reviews.facebook.net/D9789
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