Update rocksdb requirement from 0.15 to 0.17

[dependabot-preview]

Updates the requirements on rocksdb to permit the latest version.

Changelog

Sourced from rocksdb's changelog.

0.17.0 (2021-07-22)

• Fix multi_get method (mikhailOK)
• Bump librocksdb-sys up to 6.19.3 (olegnn)
• Add support for the cuckoo table format (rbost)
• RocksDB is not compiled with SSE4 instructions anymore unless the corresponding features are enabled in rustc (mbargull)
• Bump librocksdb-sys up to 6.20.3 (olegnn, akrylysov)
• Add DB::key_may_exist_cf_opt method (stanislav-tkach)
• Add Options::set_zstd_max_train_bytes method (stanislav-tkach)
• Mark Cache and Env as Send and Sync (akrylysov)
• Allow cloning the Cache and Env (duarten)
• Make SSE inclusion conditional for target features (mbargull)
• Use Self where possible (adamnemecek)
• Don't leak dropped column families (ryoqun)

0.16.0 (2021-04-18)

• Add DB::cancel_all_background_work method (stanislav-tkach)
• Bump librocksdb-sys up to 6.13.3 (aleksuss)
• Add multi_get, multi_get_opt, multi_get_cf and multi_get_cf_opt DB methods (stanislav-tkach)
• Allow setting options on a ColumnFamily (romanz)
• Fix logic related to merge operator settings (BoOTheFurious)
• Export persist_period_sec option and background_threads (developerfred)
• Remove unneeded bindgen features (Kixunil)
• Add merge delete_callback omitted by mistake (zhangsoledad)
• Bump librocksdb-sys up to 6.17.3 (ordian)
• Remove the need for &mut self in create_cf and drop_cf (v2) (ryoqun)
• Keep Cache and Env alive with Rc (acrrd)
• Add DB::open_cf_with_ttl method (fdeantoni)

0.15.0 (2020-08-25)

• Fix building rocksdb library on windows host (aleksuss)
• Add github actions CI for windows build (aleksuss)
• Update doc for Options::set_compression_type (wqfish)
• Add clippy linter in CI (aleksuss)
• Use DBPath for backup_restore test (wqfish)
• Allow to build RocksDB with a different stdlib (calavera)
• Add some doc-comments and tiny refactoring (aleksuss)
• Expose open_with_ttl. (calavera)
• Fixed build for x86_64-linux-android that doesn't support PCLMUL (vimmerru)
• Add support for SstFileWriter and DB::ingest_external_file (methyl)
• Add set_max_log_file_size and set_recycle_log_file_num to the Options (stanislav-tkach)
• Export the DEFAULT_COLUMN_FAMILY_NAME constant (stanislav-tkach)
• Fix slice transformers with no in_domain callback (nelhage)
• Don't segfault on failed a merge operator (nelhage)
• Adding read/write/db/compaction options (linxGnu)
• Add dbpath and env options (linxGnu)
• Add compaction filter factory API (unrealhoang)
• Add link stdlib when linking prebuilt rocksdb (unrealhoang)

... (truncated)

Commits

• 6e3d781 Release 0.17.0 (#539)
• abf121f Don't leak dropped column families (#509)
• 32fbd92 Use Self where possible (#538)
• 81a9ede Make SSE inclusion conditional for target features (#526)
• db377fd Allow cloning the Cache and Env (#533)
• 54cbd34 Mark Cache and Env as Send and Sync (#530)
• f00ae8c Upgrade librocksdb-sys to 6.20.3 (#531)
• 7efa1ca Merge pull request #524 from stanislav-tkach/set_zstd_max_train_bytes
• 02e663f Merge branch 'master' into set_zstd_max_train_bytes
• b6c1d54 Fix key may exist description (#521)
• Additional commits viewable in compare view

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