refactor(cve): improve CVE test time by mocking trivy (#1184)

- refactor(cve): remove the global of type cveinfo.CveInfo from the extensions package
  Replace it with an attribute on controller level
- refactor(controller): extract initialization logic from controller.Run()
- test(cve): mock cve scanner in cli tests

Signed-off-by: Andrei Aaron <aaaron@luxoft.com>

pkg/cli/image_cmd_test.go

@@ -1292,7 +1292,7 @@ func TestServerResponseGQLWithoutPermissions(t *testing.T) {
 		}
 
 		ctlr := api.NewController(conf)
-		if err := ctlr.Run(context.Background()); err != nil {
+		if err := ctlr.Init(context.Background()); err != nil {
 			So(err, ShouldNotBeNil)
 		}
 	})