Don't run tests twice

It's useless

Signed-off-by: Djordje Lukic <djordje.lukic@docker.com>

integration/config/main_test.go

@@ -44,7 +44,7 @@ func TestMain(m *testing.M) {
 	}
 	span.End()
 	shutdown(ctx)
-	os.Exit(m.Run())
+	os.Exit(code)
 }
 
 func setupTest(t *testing.T) context.Context {

integration/network/macvlan/main_test.go

@@ -50,5 +50,5 @@ func TestMain(m *testing.M) {
 	span.SetAttributes(attribute.Int("exit", code))
 	span.End()
 	shutdown(ctx)
-	os.Exit(m.Run())
+	os.Exit(code)
 }

integration/plugin/common/main_test.go

@@ -37,7 +37,7 @@ func TestMain(m *testing.M) {
 	}
 	span.SetAttributes(attribute.Int("exit", ec))
 	shutdown(ctx)
-	os.Exit(m.Run())
+	os.Exit(ec)
 }
 
 func setupTest(t *testing.T) context.Context {