terraform/hashistack/nomad_scheduler: add nomad scheduler config

and enable memory oversubscription

Author: classabbyamp

terraform/hashistack/nomad_scheduler.tf

@@ -0,0 +1,10 @@
+resource "nomad_scheduler_config" "config" {
+  scheduler_algorithm             = "binpack"
+  memory_oversubscription_enabled = true
+  preemption_config = {
+    system_scheduler_enabled   = false
+    batch_scheduler_enabled    = false
+    service_scheduler_enabled  = false
+    sysbatch_scheduler_enabled = true
+  }
+}