[cherry-pick] Update flags: --username, --password to --username=, --password= (#1428)

/cherry-pick

Signed-off-by: Emruz Hossain <emruz@appscode.com>

Co-authored-by: Emruz Hossain <emruz@appscode.com>

Author: 1gtm

pkg/backup.go

@@ -348,8 +348,8 @@ func (opt *mongoOptions) backupMongoDB(targetRef api_v1beta1.TargetRef) (*restic
 		}...)
 	} else {
 		adminCreds = []interface{}{
-			"--username", string(appBindingSecret.Data[MongoUserKey]),
-			"--password", string(appBindingSecret.Data[MongoPasswordKey]),
+			fmt.Sprintf("--username=%s", appBindingSecret.Data[MongoUserKey]),
+			fmt.Sprintf("--password=%s", appBindingSecret.Data[MongoPasswordKey]),
 			"--authenticationDatabase", opt.authenticationDatabase,
 		}
 	}

pkg/restore.go

@@ -281,8 +281,8 @@ func (opt *mongoOptions) restoreMongoDB(targetRef api_v1beta1.TargetRef) (*resti
 
 	} else {
 		adminCreds = []interface{}{
-			"--username", string(appBindingSecret.Data[MongoUserKey]),
-			"--password", string(appBindingSecret.Data[MongoPasswordKey]),
+			fmt.Sprintf("--username=%s", appBindingSecret.Data[MongoUserKey]),
+			fmt.Sprintf("--password=%s", appBindingSecret.Data[MongoPasswordKey]),
 			"--authenticationDatabase", opt.authenticationDatabase,
 		}
 	}