Rewrite netcmd and ripe whois tools (#9724)

* Port RIPE whois to Laravel

* remove netcmd.php and port to laravel.
Escape CLI and set it to stream output live.

* fix browser buffer bust on a few browsers.

includes/common.php

@@ -651,22 +651,7 @@ function format_number($value, $base = '1000', $round = 2, $sf = 3)
 
 function is_valid_hostname($hostname)
 {
-    // The Internet standards (Request for Comments) for protocols mandate that
-    // component hostname labels may contain only the ASCII letters 'a' through 'z'
-    // (in a case-insensitive manner), the digits '0' through '9', and the hyphen
-    // ('-'). The original specification of hostnames in RFC 952, mandated that
-    // labels could not start with a digit or with a hyphen, and must not end with
-    // a hyphen. However, a subsequent specification (RFC 1123) permitted hostname
-    // labels to start with digits. No other symbols, punctuation characters, or
-    // white space are permitted. While a hostname may not contain other characters,
-    // such as the underscore character (_), other DNS names may contain the underscore
-    // maximum length is 253 characters, maximum segment size is 63
-
-    return (
-        preg_match("/^([a-z\d](-*[a-z\d])*)(\.([a-z\d](-*[a-z\d])*))*\.?$/i", $hostname) //valid chars check
-        && preg_match("/^.{1,253}$/", $hostname) //overall length check
-        && preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*\.?$/", $hostname)
-    );
+    return \LibreNMS\Util\Validate::hostname($hostname);
 }
 
 /*