Specify Python interpreter when generating SECRET_KEY (fixes #35)

Author: lae

tasks/generate_secret_key.yml

@@ -1,6 +1,6 @@
 ---
 - name: Generate a SECRET_KEY for NetBox if unspecified
-  shell: "{{ netbox_current_path }}/netbox/generate_secret_key.py | tr -d $'\n' > {{ netbox_shared_path }}/generated_secret_key"
+  shell: "{{ netbox_python_binary }} {{ netbox_current_path }}/netbox/generate_secret_key.py | tr -d $'\n' > {{ netbox_shared_path }}/generated_secret_key"
   args:
     creates: "{{ netbox_shared_path }}/generated_secret_key"
   become: True