install passlib so ansible htpasswd can use it.

Former-commit-id: e71384df917cd0a0356b6ce1379840b3750aa56f

ansible/deploy.yaml

@@ -92,6 +92,8 @@
         app_path: "/home/{{ deploy_user_name }}/iPPIDB/ippisite"
         settings: "ippisite.{{ ansible_hostname }}_settings"
     # FIXME: this should obviously be removed before switching to prod. env.
+    - name: install passlib for htpasswd in ansible
+      pip: name=passlib executable=pip3
     - htpasswd:
         path: /etc/ippidb-80/passwdfile
         name: ippidb