Use salt pillars to pass test arguments during cluster creation.

cluster/saltbase/salt/kube-scheduler/kube-scheduler.manifest

@@ -1,3 +1,10 @@
+{% set params = "{{pillar['log_level']}}" -%}
+
+# test_args has to be kept at the end, so they'll overwrite any prior configuration
+{% if pillar['scheduler_test_args'] is defined -%}
+{% set params = params + " " + pillar['scheduler_test_args'] -%}
+{% endif -%}
+
 {
 "apiVersion": "v1",
 "kind": "Pod",
@@ -16,7 +23,7 @@
     "command": [
                  "/bin/sh",
                  "-c",
-                 "/usr/local/bin/kube-scheduler --master=127.0.0.1:8080 {{pillar['log_level']}} 1>>/var/log/kube-scheduler.log 2>&1"
+                 "/usr/local/bin/kube-scheduler --master=127.0.0.1:8080 {{params}} 1>>/var/log/kube-scheduler.log 2>&1"
                ],
     "livenessProbe": {
       "httpGet": {