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

config/config.go

@@ -418,7 +418,7 @@ type ServerInfo struct {
 	Optional [][]interface{}
 
 	// For CentOS, RHEL, Amazon
-	Enablerepo string
+	Enablerepo []string
 
 	// used internal
 	LogMsgAnsiColor string // DebugLog Color