nosudo on CentOS and Fetch Changelogs on Amazon, RHEL (#448)

* Use repoquery for no sudo and avoid unintended line feed of yum or rpm. #444

* Change data type of enablerepo in config.toml. string to array

* Fetch yum changelogs at once then grep CVE-IDs

* Fix changelog parse logic and Update Gopkg

report/azureblob.go

@@ -24,7 +24,7 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/Azure/azure-storage-go"
+	storage "github.com/Azure/azure-sdk-for-go/storage"
 
 	c "github.com/future-architect/vuls/config"
 	"github.com/future-architect/vuls/models"