api: Added the ability to list devices by location in the api (#5693)

* Adding location based filter for api-device calls

* I agree to the conditions of the Contributor Agreement contained in doc/General/Contributing.md.

* configured linting etc, now pr should pass

* rebase and add entry to docs

html/includes/api_functions.inc.php

@@ -210,6 +210,8 @@ function list_devices()
 
     if ($type == 'all' || empty($type)) {
         $sql = '1';
+    } elseif ($type == 'location') {
+        $sql = "`location` LIKE '%".$query."%'";
     } elseif ($type == 'ignored') {
         $sql = "`ignore`='1' AND `disabled`='0'";
     } elseif ($type == 'up') {