refact to materialize the propagation logic

- formats exports and parent-child just differ in how to discover
    their paths
  - share propagation logic for both formats

Signed-off-by: ferantivero <v-fean@microsoft.com>

pkg/chartutil/requirements.go

@@ -417,28 +417,16 @@ func processImportValues(c *chart.Chart) error {
 		if len(r.ImportValues) > 0 {
 			var outiv []interface{}
 			for _, riv := range r.ImportValues {
+				nm := make(map[string]string, 0)
 				switch iv := riv.(type) {
 				case map[string]interface{}:
-					nm := map[string]string{
+					nm["child"] = iv["child"].(string)
-						"child":  iv["child"].(string),
+					nm["parent"] = iv["parent"].(string)
-						"parent": iv["parent"].(string),
-					}
-					outiv = append(outiv, nm)
-					s := name + "." + nm["child"]
-					// get child table
-					vv, err := cvals.Table(s)
-					if err != nil {
-						log.Printf("Warning: ImportValues missing table: %v", err)
-						continue
-					}
-					// create value map from child to be merged into parent
-					vm := pathToMap(nm["parent"], vv.AsMap())
-					b = coalesceTables(b, vm, c.Metadata.Name)
 				case string:
-					nm := map[string]string{
+					nm["child"] = "exports." + iv
-						"child":  "exports." + iv,
+					nm["parent"] = "."
-						"parent": ".",
 				}
+
 				outiv = append(outiv, nm)
 				s := name + "." + nm["child"]
 				// get child table
@@ -450,7 +438,7 @@ func processImportValues(c *chart.Chart) error {
 				// create value map from child to be merged into parent
 				vm := pathToMap(nm["parent"], vv.AsMap())
 				b = coalesceTables(b, vm, c.Metadata.Name)
-				}
+
 			}
 			// set our formatted import values
 			r.ImportValues = outiv