Switch from ansible npm module to raw npm OPS-3134

Ansible npm module doesn't properly respect package-lock.json in Node 8
See PR #4292

playbooks/roles/insights/tasks/main.yml

@@ -51,12 +51,11 @@
     - install
     - install:system-requirements
 
+# install with the shell command instead of the ansible npm module so we don't accidentally re-write package.json
 - name: install node dependencies
-  npm:
-    executable: "{{ insights_nodeenv_bin }}/npm"
-    path: "{{ insights_code_dir }}"
-    production: yes
-    state: latest
+  shell: "{{ insights_nodeenv_bin }}/npm install"
+  args:
+    chdir: "{{ insights_code_dir }}"
   become_user: "{{ insights_user }}"
   environment: "{{ insights_environment }}"
   tags: