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/error.go

@@ -0,0 +1,6 @@
+package node
+
+import "errors"
+
+var ErrNotFound = errors.New("node/profile not found")
+var ErrNoUnconfigured = errors.New("no unconfigured node")