lbvserver: authnprofile attribute

[frankvdbh]

In our tests we encounter an issue when a lbvserver resource is first defined with authentication enabled ( authentication = "ON" and authnprofile is set ) and afterwards authentication is disabled. Terraform detects the change for the authentication attribute ON -> OFF, however the change for the authnprofile attribute is not detected. (Tried setting to "" or null ) As such when the authentication profile is being deleted, it fails because it is still in use.

resource "citrixadc_lbvserver" "this" {
 name        = "TF_LB_VS_${local.entityname}_INT_HTTP"
 ipv46       = "0.0.0.0"
  lbmethod    = "ROUNDROBIN"
  port        = 0
  servicetype = "HTTP"
  authnprofile = var.authentication.enabled ? "TF_AAA_PROF_OAUTH_${local.entityname}_AzureAD" : null
  authentication = var.authentication.enabled ? "ON" : "OFF"
 }