Fix bug in nb_lookup if api_filter contains multiple id (#1042)

In the `nb_lookup` plugin, if we provide an `api_filter` containing the `id` field, it will use `.get()` instead of `.filter()`, thus returning the item instead of a list. See PR #376 for more information.

This is fine if you supply only one id. But let's say you want to get a list of items by ids?

For example: `id=1 id=5`

I would expect to get a list of 2 items. But at the moment, it will return the first item only.

This change adds a simple check to see if we're supplying multiple ids.

plugins/lookup/nb_lookup.py

@@ -440,7 +440,7 @@ def run(self, terms, variables=None, **kwargs):
             if netbox_api_filter:
                 filter = build_filters(netbox_api_filter)
 
-                if "id" in filter:
+                if "id" in filter and len(filter["id"]) == 1:
                     Display().vvvv(
                         "Filter is: %s and includes id, will use .get instead of .filter"
                         % (filter)