Added modules.vsphere.gets_service_instance_via_proxy decorator
Added modules.vsphere.gets_service_instance_via_proxy decorator

- decorator that connects to a target system (vCenter or ESXi host)
  using the proxy details and passes the connection (vim.ServiceInstance)
  to the decorated function.
- the decorated function needs to have a parameter called
  service_instance

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt