Use salt pillars to pass test arguments during cluster creation.

cluster/saltbase/salt/kubelet/default

@@ -90,4 +90,12 @@
   {% set pod_cidr = "--pod-cidr=" + grains['cbr-cidr'] %}
 {% endif %} 
 
+{% set test_args = "" -%}
+{% if pillar['kubelet_test_args'] is defined -%}
+  {% set test_args=pillar['kubelet_test_args'] %}
+{% endif -%}
+
 DAEMON_ARGS="{{daemon_args}} {{api_servers_with_port}} {{debugging_handlers}} {{hostname_override}} {{cloud_provider}} {{config}} {{manifest_url}} --allow_privileged={{pillar['allow_privileged']}} {{pillar['log_level']}} {{cluster_dns}} {{cluster_domain}} {{docker_root}} {{kubelet_root}} {{configure_cbr0}} {{cgroup_root}} {{system_container}} {{pod_cidr}}"
+
+# test_args has to be kept at the end, so they'll overwrite any prior configuration
+DAEMON_ARGS="$DAEMON_ARGS + {{test_args}}"