removed NodeInfo and using NodeConf instead

This is a significant change in the undelying data model!

nodeDb, err := node.New()

will result in a structure which contains the on disk
values. Only

nodeDb.FindAllNodes() or nodeDb.GetNode(id) will give
the nodes with its merged in profiles.

Signed-off-by: Christian Goll <cgoll@suse.com>

internal/pkg/node/helper.go

@@ -0,0 +1,16 @@
+package node
+
+/*
+helper functions
+*/
+
+// string which is printed if no value is set
+const NoValue = "--"
+
+// print NoValue if string is empty
+func PrintVal(in string) (out string) {
+	if in != "" {
+		return in
+	}
+	return NoValue
+}