Issue 717: expose data service drive type

[yamingk]

Change:

1. expose data service drive type.
2. fixed one issue to destroy solo repl dev's m_sb during destroy.

Testing

Cross tested with HomeStore consumer

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 66.99%. Comparing base (1a0cef8) to head (25d68cc).
Report is 192 commits behind head on master.

Files with missing lines	Patch %	Lines
src/lib/blkdata_svc/blkdata_service.cpp	0.00%	1 Missing ⚠️
src/lib/device/virtual_dev.hpp	0.00%	1 Missing ⚠️
src/lib/logstore/log_dev.cpp	0.00%	1 Missing ⚠️
src/lib/replication/repl_dev/solo_repl_dev.cpp	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #718       +/-   ##
===========================================
+ Coverage   56.51%   66.99%   +10.47%     
===========================================
  Files         108      109        +1     
  Lines       10300    11964     +1664     
  Branches     1402     1670      +268     
===========================================
+ Hits         5821     8015     +2194     
+ Misses       3894     3117      -777     
- Partials      585      832      +247     

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[xiaoxichen]

lgtm

[sanebay]

LGTM