Debug ansible version

As vagrant and src seem to be using different versions.

research-cloud-plugin.yml

@@ -15,6 +15,10 @@
     - name: Gather facts for first time
       setup:
 
+    - name: Ansible version
+      debug:
+        var: ansible_version
+
     - name: Set up workers
       debug:
         var: worker_ip_addresses

roles/grader/tasks/main.yml

@@ -100,13 +100,21 @@
   become_user: "{{ item }}"
   changed_when: true
 
+# TODO remove debugs
+- name: Debug path
+  debug:
+    var: ansible_env.PATH
+- name : Debug bin
+  debug:
+    var: conda_environment_bin
+
 - name: Register non_grader_users as nbgrader student
   loop: "{{ non_grader_users.stdout_lines | default([]) }}"
   command:
-    cmd: '{{ conda_environment_bin }}/nbgrader db student add {{ item }}'
+    cmd: "{{ conda_environment_bin }}/nbgrader db student add {{ item }}"
     chdir: "/home/{{ grader_user }}/{{ course_id }}"
   environment:
-    # nbgrader calls subcprocess which is not in path by default
+    # nbgrader calls subprocess which is not in path by default
     PATH: "{{ conda_environment_bin }}:{{ ansible_env.PATH }}"
   become: true
   become_user: "{{ grader_user }}"