refactor(detector): standardize db.NewDB to db.CloseDB (#1380)

* feat(subcmds/report,server): read environment variables when configPath is ""

* refactor: standardize db.NewDB to db.CloseDB

* chore: clean up import

* chore: error wrap

* chore: update goval-dictionary

* fix(oval): return Pseudo instead of nil for client

* chore: fix comment

* fix: lint error

oval/pseudo.go

@@ -0,0 +1,23 @@
+package oval
+
+import "github.com/future-architect/vuls/models"
+
+// Pseudo is OVAL client for Windows, FreeBSD and Pseudo
+type Pseudo struct {
+	Base
+}
+
+// NewPseudo creates OVAL client for Windows, FreeBSD and Pseudo
+func NewPseudo(family string) Pseudo {
+	return Pseudo{
+		Base{
+			driver:  nil,
+			baseURL: "",
+			family:  family,
+		},
+	}
+}
+
+func (pse Pseudo) FillWithOval(_ *models.ScanResult) (int, error) {
+	return 0, nil
+}