Rename internal parameter user_list to hardening_user_list

The user_list parameter is a pure internal parameter. The user_list
parameter conflicts with the parameter of one of our roles. As this
is a pure internal parameter, it can simply be renamed.

Change-Id: I87ddb138ba78584ba63f463ec304460c970206ad

tasks/rhel7stig/accounts.yml

@@ -164,10 +164,10 @@
   debug:
     msg: >
       The following users have GIDs in /etc/passwd that do not exist in /etc/group:
-      {{ user_list.users | selectattr('group', 'equalto', False) | map(attribute='name') | join(', ') }}
+      {{ hardening_user_list.users | selectattr('group', 'equalto', False) | map(attribute='name') | join(', ') }}
   when:
-    - user_list is defined
-    - user_list.users | selectattr('group', 'equalto', False) | list | length > 0
+    - hardening_user_list is defined
+    - hardening_user_list.users | selectattr('group', 'equalto', False) | list | length > 0
   tags:
     - accounts
     - low
@@ -200,10 +200,10 @@
   debug:
     msg: |
       The following users do not have a home directory assigned:
-      {{ user_list.users | selectattr('dir', 'equalto', '') | map(attribute='name') | join(', ') }}
+      {{ hardening_user_list.users | selectattr('dir', 'equalto', '') | map(attribute='name') | join(', ') }}
   when:
-    - user_list is defined
-    - user_list.users | selectattr('dir', 'equalto', '') | map(attribute='name') | list | length > 0
+    - hardening_user_list is defined
+    - hardening_user_list.users | selectattr('dir', 'equalto', '') | map(attribute='name') | list | length > 0
   tags:
     - accounts
     - medium
@@ -214,7 +214,7 @@
     path: "{{ item['dir'] }}"
   when:
     - item['dir'] | length > 0
-  with_items: "{{ user_list.users }}"
+  with_items: "{{ hardening_user_list.users }}"
   register: home_directory_checks
   tags:
     - accounts

tasks/rhel7stig/file_perms.yml

@@ -102,7 +102,7 @@
     - item.uid >= 1000
     - item.name != 'nobody'
     - security_set_home_directory_permissions_and_owners | bool
-  with_items: "{{ user_list.users | selectattr('uid', 'greaterthan', 999) | list }}"
+  with_items: "{{ hardening_user_list.users | selectattr('uid', 'greaterthan', 999) | list }}"
   tags:
     - medium
     - file_perms

tasks/rhel7stig/main.yml

@@ -40,7 +40,7 @@
 - name: Get user data for all users on the system
   get_users:
     min_uid: 0
-  register: user_list
+  register: hardening_user_list
   check_mode: no
   tags:
     - always