Adjust num chunks requested in device manager.

[sanebay]

Disable index btree remove api's as its conflict with cp flush.
Fix timer related asan user after free issue while running UT's.

[hkadayam]

Minor comment

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (bd80010) 56.14% compared to head (cd31e11) 69.38%.
Report is 2 commits behind head on master.

❗ Current head cd31e11 differs from pull request most recent head 627079e. Consider uploading reports for the commit 627079e to get more accurate results

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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #197       +/-   ##
===========================================
+ Coverage   56.14%   69.38%   +13.23%     
===========================================
  Files         108       93       -15     
  Lines        9676     7530     -2146     
  Branches     1199      960      -239     
===========================================
- Hits         5433     5225      -208     
+ Misses       3768     1851     -1917     
+ Partials      475      454       -21     

Files	Coverage Δ
src/include/homestore/blkdata_service.hpp	100.00% <ø> (ø)
src/include/homestore/index_service.hpp	50.00% <ø> (+50.00%)	⬆️
src/include/homestore/logstore_service.hpp	100.00% <ø> (+66.66%)	⬆️
src/include/homestore/meta_service.hpp	100.00% <ø> (ø)
src/lib/blkdata_svc/blkdata_service.cpp	41.34% <ø> (ø)
src/lib/device/device_manager.cpp	76.74% <100.00%> (+0.44%)	⬆️
src/lib/device/physical_dev.cpp	80.34% <100.00%> (+1.61%)	⬆️
src/lib/homestore.cpp	86.74% <100.00%> (+13.45%)	⬆️
src/lib/index/index_service.cpp	83.33% <100.00%> (+83.33%)	⬆️
src/lib/logstore/log_store_service.cpp	71.68% <100.00%> (+8.75%)	⬆️
... and 1 more

... and 65 files with indirect coverage changes

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