Add configuration for tiller storage

This adds a parameter to the armada and tiller charts
to configure the tiller storage [0] type. For backward
compatibility, by default the parameter is not passed
to tiller, thus relying on the upstream default, which
is 'configmap'.

[0]: https://helm.sh/docs/using_helm/#tiller-s-release-information

Change-Id: I5d2a7558e3847331a0ce95c15b2e741f96130674

charts/armada/templates/deployment-api.yaml

@@ -152,6 +152,9 @@ spec:
               value: {{ .Values.conf.tiller.history_max | quote }}
           command:
             - /tiller
+{{- if .Values.conf.tiller.storage }}
+            - --storage={{ .Values.conf.tiller.storage | quote }}
+{{- end }}
             - -logtostderr
             - -v
             - {{ .Values.conf.tiller.verbosity | quote }}

charts/armada/values.yaml

@@ -209,6 +209,7 @@ conf:
     port: 44134
     verbosity: 5
     trace: false
+    storage: null
     namespace: kube-system
     # Limit the maximum number of revisions saved per release. 0 for no limit.
     history_max: 0

charts/tiller/templates/deployment-tiller.yaml

@@ -75,6 +75,9 @@ spec:
               value: {{ .Values.deployment.tiller_history | quote }}
           command:
             - /tiller
+{{- if .Values.conf.tiller.storage }}
+            - --storage={{ .Values.conf.tiller.storage | quote }}
+{{- end }}
             - -logtostderr
             - -v
             - {{ .Values.conf.tiller.verbosity | quote }}

charts/tiller/values.yaml

@@ -44,6 +44,7 @@ deployment:
 conf:
   tiller:
     verbosity: 5
+    storage: null
     trace: false
     # Note: Defaulting to the (default) kubernetes grace period, as anything
     # greater than that will have no effect.