edit storage serial_number

[zhilong-xu]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Release note:

[codecov]

Codecov Report

Merging #606 (9d41fed) into macro_san (4ba8e59) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

@@              Coverage Diff              @@
##           macro_san     #606      +/-   ##
=============================================
- Coverage      71.37%   71.35%   -0.02%     
=============================================
  Files            187      187              
  Lines          23067    23067              
  Branches        3508     3508              
=============================================
- Hits           16463    16460       -3     
- Misses          5490     5491       +1     
- Partials        1114     1116       +2     

Impacted Files	Coverage Δ
delfin/drivers/macro_san/ms/ms_handler.py	65.08% <50.00%> (ø)
delfin/drivers/fake_storage/__init__.py	94.67% <0.00%> (-0.77%)	⬇️