chore(e2e): Define docker attributes to prevent forced replacement on second launch (#4918)

* chore(e2e): Define settings to prevent forced replacement

On a second `terraform apply`, there were a few attributes forcing the replacement (i.e. regeneration) of the resource. This commit defines some attributes explicitly to prevent the regeneration from occurring.

* chore(e2e): Add extra timeout for openssh server

enos/modules/docker_postgres/main.tf

@@ -79,8 +79,9 @@ resource "docker_container" "postgres" {
     timeout  = "5s"
     retries  = 5
   }
-  wait     = true
-  must_run = true
+  wait         = true
+  must_run     = true
+  network_mode = "bridge"
   dynamic "networks_advanced" {
     for_each = var.network_name
     content {