Warn no ip (#922)

* fix(scan): ignore wp-cli stderr messages (#825) (#915)

* fix(scan): warn if unable to get ip address on the scan tareget server

* fix test case

scan/debian.go

@@ -241,7 +241,8 @@ func (o *debian) checkDeps() error {
 func (o *debian) preCure() error {
 	o.log.Infof("Scanning in %s", o.getServerInfo().Mode)
 	if err := o.detectIPAddr(); err != nil {
-		o.log.Debugf("Failed to detect IP addresses: %s", err)
+		o.log.Warnf("Failed to detect IP addresses: %s", err)
+		o.warns = append(o.warns, err)
 	}
 	// Ignore this error as it just failed to detect the IP addresses
 	return nil