Fix config unit tests

Recent changes to config and logging modules have left the tests needing
to initialize both config and logging packages. This commit updates the
config module to automatically initialize into at least useful defaults
at module load time. This commit also fixes the config unit tests by
using the more up to date interface that the package provides.

Signed-off-by: Ava Affine <ava@sunnypup.io>

internal/config/config.go

@@ -18,10 +18,22 @@ type AppConfig struct {
 
 var config *AppConfig
 
+func init() {
+	setDefaults()
+	viper.Unmarshal(&config)
+}
+
 func Get() *AppConfig {
 	return config
 }
 
+func GetDefaultConfig() *AppConfig {
+	var config *AppConfig
+	setDefaults()
+	viper.Unmarshal(&config)
+	return config
+}
+
 func Init() error {
 	setDefaults()