[KeyVault] Migrate tests and remove legacy tests.

[schaabs]

No description provided.

[azuresdkci]

Can one of the admins verify this patch?

[codecov-io]

Codecov Report

Merging #2590 into keyvault_1.0_preview will increase coverage by 0.1%.
The diff coverage is n/a.

@@                   Coverage Diff                   @@
##           keyvault_1.0_preview    #2590     +/-   ##
=======================================================
+ Coverage                 56.19%    56.3%   +0.1%     
=======================================================
  Files                      6530     6530             
  Lines                    141715   141715             
=======================================================
+ Hits                      79634    79786    +152     
+ Misses                    62081    61929    -152

Impacted Files	Coverage Δ
...eyvault/azure/mgmt/keyvault/models/resource_py3.py	45.45% <0%> (-54.55%)	⬇️
...lt/models/vault_create_or_update_parameters_py3.py	55.55% <0%> (-44.45%)	⬇️
...yvault/models/vault_create_or_update_parameters.py	55.55% <0%> (-44.45%)	⬇️
...zure/mgmt/keyvault/operations/vaults_operations.py	13.51% <0%> (-34.13%)	⬇️
...ault/azure/keyvault/models/backup_secret_result.py	71.42% <0%> (-28.58%)	⬇️
...azure/keyvault/models/secret_restore_parameters.py	71.42% <0%> (-28.58%)	⬇️
...vault/azure/mgmt/keyvault/models/resource_paged.py	80% <0%> (-20%)	⬇️
...keyvault/azure/mgmt/keyvault/models/vault_paged.py	80% <0%> (-20%)	⬇️
...ure-keyvault/azure/keyvault/custom/key_vault_id.py	90.9% <0%> (+0.64%)	⬆️
azure-keyvault/azure/keyvault/key_vault_client.py	74.76% <0%> (+5.42%)	⬆️
... and 23 more

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