Refactor logger (#1185)

* refactor: logger

* refactor: logging

* refactor: rename func

* refactor: logging

* refactor: logging format

scanner/rhel.go

@@ -2,8 +2,8 @@ package scanner
 
 import (
 	"github.com/future-architect/vuls/config"
+	"github.com/future-architect/vuls/logging"
 	"github.com/future-architect/vuls/models"
-	"github.com/future-architect/vuls/util"
 	"golang.org/x/xerrors"
 )
 
@@ -25,7 +25,7 @@ func newRHEL(c config.ServerInfo) *rhel {
 			sudo: rootPrivRHEL{},
 		},
 	}
-	r.log = util.NewCustomLogger(c)
+	r.log = logging.NewNormalLogger()
 	r.setServerInfo(c)
 	return r
 }