Add initial interface for load balancers support
Add metadata support to the load balancers service interface
Add missing connection throttles stub methods
Implement initial load balancer metadata support
Initial support for load balancer session persistence configuration
Implement support for load balancer connection logging configuration
Implement support for load balancer content caching configuration
Implement support for load balancer connection throttle configuration
Initial support for load balancer custom error page configuration
Implement support for load balancer Allowed Domains calls
Add LoadBalancerEnabledFlag
Update operations on error pages are asynchronous on the server side
Extract async utilities to ProviderBase
Add support for checking load balancer statistics
Add completion option support to API methods that reconfigure load balancers
Add initial class for UserLoadBalancersTests (no actual tests)
Remove unused field (fixes build warning)
Add most remaining load balancer functionality
* Improve efficiency of waiting for a load balancer to leave a state

* Progress callbacks should always listen for LoadBalancer polling
* CreateAccessList doesn't return the created NetworkItem(s)
Implement support for nodes, virtual addresses, and SSL configuration