Warn user if using "securityonion" as hostname

setup/so-functions

@@ -398,6 +398,13 @@ collect_hostname() {
 
 	whiptail_set_hostname "$HOSTNAME"
 
+
+	if [[ $HOSTNAME == 'securityonion' ]]; then # Will only check HOSTNAME=securityonion once
+		if ! (whiptail_avoid_default_hostname); then
+			whiptail_set_hostname
+		fi
+	fi
+
 	while ! valid_hostname "$HOSTNAME"; do
 		whiptail_invalid_hostname
 		whiptail_set_hostname "$HOSTNAME"