Report bad entries in storage.conf to the user

Currently if a user puts a typo into a storage.conf
or puts the keys in the wrong section, then tools using
container/storage ignore them. This patch will print them
as warnings, so that the user has some idea what is going on.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

storage/types/options.go

@@ -2,7 +2,6 @@ package types
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -272,21 +271,21 @@ func ReloadConfigurationFileIfNeeded(configFile string, storeOptions *StoreOptio
 // ReloadConfigurationFile parses the specified configuration file and overrides
 // the configuration in storeOptions.
 func ReloadConfigurationFile(configFile string, storeOptions *StoreOptions) {
-	data, err := ioutil.ReadFile(configFile)
+	config := new(tomlConfig)
-	if err != nil {
+
+	meta, err := toml.DecodeFile(configFile, &config)
+	if err == nil {
+		keys := meta.Undecoded()
+		if len(keys) > 0 {
+			logrus.Warningf("Failed to decode the keys %q from %q.", keys, configFile)
+		}
+	} else {
 		if !os.IsNotExist(err) {
 			fmt.Printf("Failed to read %s %v\n", configFile, err.Error())
 			return
 		}
 	}
 
-	config := new(tomlConfig)
-
-	if _, err := toml.Decode(string(data), config); err != nil {
-		fmt.Printf("Failed to parse %s %v\n", configFile, err.Error())
-		return
-	}
-
 	// Clear storeOptions of previos settings
 	*storeOptions = StoreOptions{}
 	if config.Storage.Driver != "" {