vsp host view do some optimize

[tanjiangyu-ghca]

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 #499 (74806b5) into vsp_host (e62eb59) will decrease coverage by 0.02%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##           vsp_host     #499      +/-   ##
============================================
- Coverage     70.48%   70.46%   -0.03%     
============================================
  Files           180      180              
  Lines         18813    18825      +12     
  Branches       2781     2785       +4     
============================================
+ Hits          13261    13265       +4     
- Misses         4691     4694       +3     
- Partials        861      866       +5     

Impacted Files	Coverage Δ
delfin/drivers/hitachi/vsp/rest_handler.py	40.40% <50.00%> (ø)
delfin/drivers/hitachi/vsp/vsp_stor.py	68.40% <75.60%> (-0.06%)	⬇️
delfin/drivers/hitachi/vsp/consts.py	100.00% <100.00%> (ø)
delfin/drivers/fake_storage/__init__.py	93.38% <0.00%> (-1.02%)	⬇️