vmss: support * to list instance view across vms

[yugangw-msft]

fix #2459

[codecov-io]

Codecov Report

Merging #2467 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2467      +/-   ##
==========================================
+ Coverage   72.44%   72.45%   +0.01%     
==========================================
  Files         362      362              
  Lines       19547    19547              
  Branches     2865     2865              
==========================================
+ Hits        14160    14162       +2     
+ Misses       4475     4472       -3     
- Partials      912      913       +1

Impacted Files	Coverage Δ
...zure-cli-vm/azure/cli/command_modules/vm/custom.py	74.5% <ø> (+0.22%)	✅
...dback/azure/cli/command_modules/feedback/custom.py	34.69% <0%> (ø)	✅
src/azure-cli-core/azure/cli/core/_util.py	66.66% <0%> (ø)	✅

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d797107...47b28ad. Read the comment docs.