Add requres manifest entry to wifi scanning (BugFix) (#1710)

* Add requres manifest entry

* Import the manifest

providers/base/units/wireless/jobs.pxu

@@ -1,4 +1,3 @@
-
 id: wireless/detect
 category_id: com.canonical.plainbox::wireless
 plugin: shell
@@ -24,6 +23,7 @@ command:
   wifi_nmcli_test.py scan {{ interface }}
 plugin: shell
 category_id: com.canonical.plainbox::wireless
+imports: from com.canonical.plainbox import manifest
 estimated_duration: 6
 _purpose:
  Check system can find a wireless network AP nearby
@@ -33,6 +33,7 @@ requires:
  connections.slot == 'network-manager:service' and connections.plug == '{{ __system_env__["SNAP_NAME"] }}:network-manager'
  {% endif -%}
  net_if_management.device == '{{ interface }}' and net_if_management.managed_by == 'NetworkManager'
+ manifest.has_wlan_adapter == 'True'
 
 unit: template
 template-resource: device