access: move secrets to password store

Keeping ansible-vault values in NetBox is too cumbersome and limited.

roles/access/tasks/main.yml

@@ -1,3 +1,7 @@
+- name: Get switch password
+  set_fact:
+    ansible_ssh_pass: '{{ lookup("passwordstore", "hosts/"~inventory_hostname, subkey="pass") }}'
+
 # This should be provided by the netbox inventory plugin but isn’t yet.
 # https://github.com/netbox-community/ansible_modules/issues/1007
 - name: Fetch configuration from netbox