edit list_masking_views func

[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 #496 (419ecc3) into eternus-mapping (895fcef) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           eternus-mapping     #496   +/-   ##
================================================
  Coverage            71.05%   71.05%           
================================================
  Files                  180      180           
  Lines                19091    19091           
  Branches              2843     2843           
================================================
  Hits                 13566    13566           
  Misses                4660     4660           
  Partials               865      865           

Impacted Files	Coverage Δ
delfin/drivers/fujitsu/eternus/eternus_stor.py	88.39% <ø> (ø)
delfin/drivers/fake_storage/__init__.py	94.40% <0.00%> (ø)