Miscellaneous bugfixs from release

[harjain99]

• Fixes subnet creation
  • Networks were created with a default subnet covering the entire network range if one wasn't provided
  • this made it impossible to create other subnets
  • the fix was to specify subnets in the network creation call
• The enableMultipleStandardLoadBalancers in the K8s cluster network profile was getting a default value set, which is no longer supported by the api.
• Fixes public container creation
  • There is a delay for the StorageAccount to actually become public.
  • Unfortunately the api doesn't really provide a good way to determine if the account is actually public.
  • The fix was to add a wait/retry on the container creation call which results in a 409 error if the creation isn't successful

[tloisel1]

Code review looks okay

[deepanjan90]

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