Added voltha-infra chart
Added voltha-stack chart
Moved "defaults" values to "global" so that they can be managed by the
macro charts
Added examples for different workflows

Change-Id: I5fb2bfa54a1be725892445e93bd8a35d608e5d14
diff --git a/bbsim-sadis-server/values.yaml b/bbsim-sadis-server/values.yaml
index bc2d5ef..a538604 100644
--- a/bbsim-sadis-server/values.yaml
+++ b/bbsim-sadis-server/values.yaml
@@ -13,7 +13,7 @@
 # limitations under the License.
 ---
 # Default overrides
-defaults:
+global:
   log_level: "WARN"
   log_format: "json"
   image_registry: ""
@@ -29,7 +29,7 @@
 
 images:
   bbsim_sadis_server:
-    registry: '{{ .Values.defaults.image_registry }}'
-    repository: '{{ .Values.defaults.image_org }}bbsim-sadis-server'
-    tag: '{{- if hasKey .Values.defaults "image_tag" }}{{- if .Values.defaults.image_tag }}{{ .Values.defaults.image_tag }}{{- else }}{{ .Chart.AppVersion }}{{- end }}{{- else }}{{ .Chart.AppVersion }}{{- end }}'
-    pullPolicy: '{{ .Values.defaults.image_pullPolicy | default "Always" }}'
+    registry: '{{ .Values.global.image_registry }}'
+    repository: '{{ .Values.global.image_org }}bbsim-sadis-server'
+    tag: '{{- if hasKey .Values.global "image_tag" }}{{- if .Values.global.image_tag }}{{ .Values.global.image_tag }}{{- else }}{{ .Chart.AppVersion }}{{- end }}{{- else }}{{ .Chart.AppVersion }}{{- end }}'
+    pullPolicy: '{{ .Values.global.image_pullPolicy | default "Always" }}'