Makes ALB SG Name Unique

Having more than one SH in a VPC requires unique names for the security
groups. This is required for qcompliance, but will be useful for the
others.

To be tagged v1.10.7

base/splunk_servers/searchhead/main.tf

@@ -203,7 +203,7 @@ data "template_cloudinit_config" "cloud-init" {
 #   Egress:
 #     tcp/8089      - Splunk API + IDX Discovery - Entire VPC + var.splunk_legacy_cidr
 resource "aws_security_group" "searchhead_security_group" {
-  name = "searchhead_security_group"
+  name = "${ var.prefix }_searchhead_security_group"
   description = "Security Group for Splunk Searchhead Instance(s)"
   vpc_id = var.vpc_id
   tags = merge(var.standard_tags, var.tags)