Better default python interpreter for mongodb role

roles/mongodb/meta/main.yml

@@ -21,7 +21,7 @@ dependencies:
     when: ansible_os_family == 'RedHat'
   - role: bobbyrenwick.pip
     when: mongodb_enable_auth
-    python: "{{ ansible_python_interpreter | default('python') }}"
+    python: "{{ mongodb_python }}"
     pip_proxy: "{{ ansible_env.https_proxy | default(ansible_env.http_proxy | default('')) }}"
     # defaults:
     # pip: pip # the executable to check for

roles/mongodb/vars/main.yml

@@ -7,3 +7,5 @@ mongodb_apt_keys:
 
 # The admin database, used to add users
 mongodb_admin_db: admin
+
+mongodb_python: "{{ ansible_python_interpreter | default( ansible_python.executable | default('python') ) }}"