Data Service Recovery and its test case.

[yamingk]

Add Data Service Recovery and its test case.

The recovery flow for data service is(most of the logic are already there):

1. load_vdev -> open_vdev
2. vdev->add_chunk(...) -> create_blk_allocator for each chunk, each blk allocator register meta_blk_found callback for every possible meta blks possibly written before recovery boot.
3. Start meta blk service
4. Each BlkAllocator instance receives meta blks from MetaSvc (via pre-registered callback), and load them into memory.
5. Recovery done.
6. Start serving I/O requests;

A new test case added with alloc/write/free/cp_flush, then recover, followed by another round of alloc/write/cp.

Test case added and passed.

[codecov-commenter]

Codecov Report

Patch coverage: 45.00% and project coverage change: -4.71% ⚠️

Comparison is base (91b264a) 54.10% compared to head (8eac11e) 49.39%.
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
- Coverage   54.10%   49.39%   -4.71%     
==========================================
  Files          96       86      -10     
  Lines        8922     7108    -1814     
  Branches     1112      915     -197     
==========================================
- Hits         4827     3511    -1316     
+ Misses       3685     3260     -425     
+ Partials      410      337      -73     

Files Changed	Coverage Δ
src/lib/blkdata_svc/blkdata_service.cpp	74.60% <ø> (ø)
src/lib/device/chunk.h	89.47% <0.00%> (-4.98%)	⬇️
src/lib/device/device_manager.cpp	76.30% <ø> (ø)
src/lib/device/journal_vdev.cpp	17.22% <ø> (ø)
src/lib/device/physical_dev.cpp	76.79% <ø> (ø)
src/lib/device/round_robin_chunk_selector.h	100.00% <ø> (ø)
src/lib/device/vchunk.cpp	0.00% <0.00%> (ø)
src/lib/device/virtual_dev.hpp	88.23% <ø> (ø)
src/lib/index/wb_cache.cpp	0.00% <ø> (ø)
src/lib/logstore/log_store_service.cpp	62.93% <ø> (ø)
... and 6 more

... and 23 files with indirect coverage changes

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