Misc fixes 2 (#15190)

* Fix error when missing poller data

* Apparently impossible to detect regex without error, so require regex always.  Update docs.

* Apparently this adva code is garbage :D

* Missing count sensor type

* Processor handle missing input

* Handle missing ifName a little better

* Yep, ports module is a dumpster fire.  Attempt to clean up some.

* apparently os yaml trying to replace on non-existent fields

* Might as well define all sensor type units

* revert previous fix, real issue was vlans module does not have polling.

tests/OSModulesTest.php

@@ -123,8 +123,8 @@ class OSModulesTest extends DBTestCase
             $actual = $results[$module]['discovery'] ?? [];
             $this->checkTestData($expected, $actual, 'Discovered', $os, $module, $filename, $helper, $phpunit_debug);
 
-            if ($module === 'route') {
-                // no route poller module
+            // modules without polling
+            if (in_array($module, ['route', 'vlans'])) {
                 continue;
             }