Increase live test operation coverage for 20 core RPs to 60%+ in mgmt. SDK

[tadelesh]

@Alancere Please update the status in this issue's comment.
Refer: https://chenjieshistorage.z13.web.core.windows.net/mgmtReport.html

[Alancere]

mgmt	code coverage	pr link
armcompute	33.1%	#20048
armnetwork	27.8%	#20331
armstorage	54.2%	#20346

[lirenhe]

Some challenges by leveragijng dotnet recording => test scenario => go live test.

[lirenhe]

5 services completed including 2 PRs not merged. Please focus on the operation coverage

[Alancere]

mgmt report: https://chenjieshistorage.z13.web.core.windows.net/mgmtReport.html

[lirenhe]

60% of average coverage.