Add test on initialization of viper/remote

This test can detect errors with dependencies like #658.

remote/remote_test.go

@@ -0,0 +1,13 @@
+package remote
+
+import (
+	"testing"
+
+	"github.com/spf13/viper"
+)
+
+func Test_init(t *testing.T) {
+	if viper.RemoteConfig == nil {
+		t.Fatal("viper.RemoteConfig() is nil, want non nil")
+	}
+}