allow pre-existing floating IPs to be specified with k8s_master_fips (#6755)

k8s_master_no_etcd_fips should not be input var

contrib/terraform/openstack/variables.tf

@@ -156,6 +156,12 @@ variable "dns_nameservers" {
   default     = []
 }
 
+variable "k8s_master_fips" {
+  description = "specific pre-existing floating IPs to use for master nodes"
+  type        = list(string)
+  default     = []
+}
+
 variable "floatingip_pool" {
   description = "name of the floating ip pool to use"
   default     = "external"