feature: allow scripts to be run from any working directory (#4437)

* feature: allow validate.php to be run from any working directory

* remove redundant realpath() call

* re-add realpath() to remove symbolic links

* realpath() isn't needed...

* chdir() in all php scripts in ./ and ./scripts/

* update-sql.php clearly is not used, as it was broken.

* Change some scripts to executable
Remove extra chdir() call in snmp-scan.php

* Missed console-ui.php
Kind of fixed console-ui.php help output

* Re-add newline

config_to_json.php

@@ -1,3 +1,4 @@
+#!/usr/bin/env php
 <?php
 
 /*
@@ -6,24 +7,11 @@
  *
  */
 
-$defaults_file = 'includes/defaults.inc.php';
-$config_file   = 'config.php';
-
-// move to install dir
-chdir(dirname($argv[0]));
-
-function iscli()
-{
-    if (php_sapi_name() == 'cli' && empty($_SERVER['REMOTE_ADDR'])) {
-        return true;
-    } else {
-        return false;
-    }
-}
+chdir(__DIR__); // cwd to the directory containing this script
 
 // check if we are running through the CLI, otherwise abort
-if (iscli()) {
-    include_once $defaults_file;
-    include_once $config_file;
-    print (json_encode($config));
+if (php_sapi_name() == 'cli' && empty($_SERVER['REMOTE_ADDR'])) {
+    include_once 'includes/defaults.inc.php';
+    include_once 'config.php';
+    echo json_encode($config);
 }