Improve implementation around config (#1122)

* refactor config

* fix saas config

* feat(config): scanmodule for each server in config.toml

* feat(config): enable to specify containersOnly in config.toml

* add new keys of config.toml to discover.go

* fix summary output, logging

models/library.go

@@ -30,6 +30,13 @@ func (lss LibraryScanners) Find(path, name string) map[string]types.Library {
 	return filtered
 }
 
+func (lss LibraryScanners) Total() (total int) {
+	for _, lib := range lss {
+		total += len(lib.Libs)
+	}
+	return
+}
+
 // LibraryScanner has libraries information
 type LibraryScanner struct {
 	Path string