Delete all test devices

it can happen where the test device gets added multiple times.  this would break the old code as it could not delete the second device.

Author: murrant

LibreNMS/Util/ModuleTestHelper.php

@@ -34,6 +34,7 @@
 use DeviceCache;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Log;
 use Illuminate\Support\Str;
 use LibreNMS\Data\Source\SnmpResponse;
@@ -559,7 +560,8 @@ public function generateTestData(string $snmpSimIp, int $snmpSimPort, bool $noSa
 
         // Remove existing device in case it didn't get removed previously, if we're not running in CI
         if (! getenv('CI') && ($existing_device = device_by_name($snmpSimIp)) && isset($existing_device['device_id'])) {
-            delete_device($existing_device['device_id']);
+            DB::table('devices')->where('hostname', $snmpSimIp)->delete();
+            DeviceCache::flush();
         }
 
         // Add the test device