Comment the workaround needed for ICMPv6 protocol name in terraform

cesnet-mcc/terraform/vms.tf

@@ -27,6 +27,7 @@ resource "openstack_compute_secgroup_v2" "ping" {
   rule {
     from_port   = 128
     to_port     = 0
+    # initial installation (bug in terraform): ip_protocol = "icmp"
     ip_protocol = "ipv6-icmp"
     cidr        = "::/0"
   }