[ACS] 3.0.0 version with flattened properties and new endpoint

[mboersma]

• Flattened ManagedCluster so there is no separate properties object
• Added get_access_profiles operation to managed clusters
• Finally generated from public swagger spec (see [ACS] add AKS (managed Kubernetes clusters) azure-rest-api-specs#1956)

Requires Azure/azure-rest-api-specs#2140 merged
Refs Azure/azure-cli#5086
See also #1700.

[codecov-io]

Codecov Report

Merging #1699 into master will decrease coverage by 0.01%.
The diff coverage is 29.54%.

@@            Coverage Diff             @@
##           master    #1699      +/-   ##
==========================================
- Coverage   55.42%   55.41%   -0.02%     
==========================================
  Files        4197     4190       -7     
  Lines       99683    99627      -56     
==========================================
- Hits        55253    55211      -42     
+ Misses      44430    44416      -14

Impacted Files	Coverage Δ
.../mgmt/containerservice/models/container_service.py	100% <ø> (ø)	⬆️
...ice/models/container_service_agent_pool_profile.py	100% <ø> (ø)	⬆️
...erservice/models/container_service_client_enums.py	100% <ø> (ø)	⬆️
...e/models/container_service_orchestrator_profile.py	100% <ø> (ø)	⬆️
...vice/models/container_service_ssh_configuration.py	100% <ø> (ø)	⬆️
...service/models/container_service_master_profile.py	100% <ø> (ø)	⬆️
...els/container_service_service_principal_profile.py	62.5% <ø> (ø)	⬆️
...rservice/models/container_service_linux_profile.py	100% <ø> (ø)	⬆️
...ce/models/container_service_diagnostics_profile.py	83.33% <ø> (ø)	⬆️
...ice/models/managed_cluster_pool_upgrade_profile.py	55.55% <ø> (ø)	⬆️
... and 10 more

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