[KeyVault] Data-plane updates to support multi api

[schaabs]

Still working on the test updates but submitting pull request so we can develop the CLI updates in parallel.

[azuresdkci]

Can one of the admins verify this patch?

[codecov-io]

Codecov Report

Merging #3053 into master will decrease coverage by 0.38%.
The diff coverage is 64.59%.

@@            Coverage Diff             @@
##           master    #3053      +/-   ##
==========================================
- Coverage   57.59%    57.2%   -0.39%     
==========================================
  Files        7845     8002     +157     
  Lines      159380   162394    +3014     
==========================================
+ Hits        91796    92903    +1107     
- Misses      67584    69491    +1907

Impacted Files	Coverage Δ
.../v2016_10_01/models/certificate_issuer_item_py3.py	57.14% <ø> (ø)
...vault/azure/keyvault/v7_0/models/key_properties.py	100% <ø> (ø)
...t/azure/keyvault/v2016_10_01/models/trigger_py3.py	62.5% <ø> (ø)
...ault/azure/keyvault/v7_0/models/lifetime_action.py	100% <ø> (ø)
...ult/azure/keyvault/v7_0/models/certificate_item.py	100% <ø> (ø)
azure-keyvault/azure/keyvault/key_vault_client.py	74.73% <ø> (-2.26%)	⬇️
...azure/keyvault/v7_0/models/certificate_item_py3.py	100% <ø> (ø)
...e-keyvault/azure/keyvault/v7_0/models/error_py3.py	100% <ø> (ø)
...yvault/v2016_10_01/models/secret_properties_py3.py	66.66% <ø> (ø)
...2016_10_01/models/subject_alternative_names_py3.py	50% <ø> (ø)
... and 535 more

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