Deprecate mgmt v1 calls

[davidpatrick]

Changes

Added warning to v1 calls. These endpoints are no longer available for public saas customers

[lbalmaceda]

many of these methods have an endpoint available on v2 that does sort of the same. While the generic message is OK, I think we should at least point to those methods in the docs of each old method.

e.g.

//Get a client by its ID. 
//This method has been deprecated. Please use v2ClientsGet.
fun v1ClientsGet{
  warn "apiv1 is deprecated"
  //...
}