add users without sudo (gh_user_no_sudo)

It's handy to be able to create users that *don't* have sudo rights.
Here at Stanford we use this to add users to our VPC bastion box (ssh
proxy) so these users can use this machine for ssh tunneling, but I
don't want to give those users the keys to the kingdom.

This let's me configure a playbook like this.

   roles:
     - common
     - supervisor
     - role: gh_users
       gh_users:
         - su1
         - su2
         - su3
       gh_users_no_sudo:
         - normal1
         - normal2

The new gh_users_no_sudo list can be empty.

playbooks/edx-west/prod-jumpbox.yml

@@ -8,3 +8,18 @@
   roles:
     - common
     - supervisor
+    - role: gh_users
+      gh_users:
+        - sefk
+        - jbau
+        - jrbl
+        - ali123
+        - caesar2164
+        - dcadams
+        - nparlante
+      gh_users_no_sudo:
+        - jinpa
+        - gbruhns
+        - paepcke
+        - akshayak
+      tags: users

playbooks/roles/gh_users/defaults/main.yml

@@ -3,3 +3,4 @@
 # update the system bashrc default
 GH_USERS_PROMPT: ""
 gh_users: []
+gh_users_no_sudo: []

playbooks/roles/gh_users/tasks/main.yml

@@ -10,6 +10,8 @@
 #     gh_users:
 #      - joe
 #      - mark
+#     gh_users_no_sudo:
+#      - tourist_dave
 
 
 - name: creating default .bashrc
@@ -27,22 +29,28 @@
     dest=/etc/sudoers.d/gh owner=root group=root
     mode=0440 validate='visudo -cf %s'
 
-- name: create github users
+- name: create sudo github users
   user:
     name={{ item }} groups=gh
     shell=/bin/bash
   with_items: gh_users
 
+- name: create non-sudo github users
+  user:
+    name={{ item }}
+    shell=/bin/bash
+  with_items: gh_users_no_sudo
+
 - name: create .ssh directory
   file:
     path=/home/{{ item }}/.ssh state=directory mode=0700
     owner={{ item }}
-  with_items: gh_users
+  with_items: gh_users + gh_users_no_sudo
 
 - name: copy github key[s] to .ssh/authorized_keys
   get_url:
     url=https://github.com/{{ item }}.keys
     dest=/home/{{ item }}/.ssh/authorized_keys mode=0600
     owner={{ item }}
-  with_items: gh_users
+  with_items: gh_users + gh_users_no_sudo