Merge branch 'show-ip-addresses' into 'master'

Add user's last used IP addresses to admin page

This would help admins figure out from where spam is originating.

Screenshot:

![image](/uploads/984005a3a35b7004bd0a363081eb53ba/image.png)


See merge request !2381

CHANGELOG

@@ -5,6 +5,7 @@ v 8.4.0 (unreleased)
   - Improved performance of finding issues for an entire group (Yorick Peterse)
   - Added custom application performance measuring system powered by InfluxDB (Yorick Peterse)
   - Bump fog to 1.36.0 (Stan Hu)
+  - Add user's last used IP addresses to admin page (Stan Hu)
   - Add housekeeping function to project settings page
   - The default GitLab logo now acts as a loading indicator
   - Fix caching issue where build status was not updating in project dashboard (Stan Hu)

app/views/admin/users/show.html.haml

@@ -70,6 +70,14 @@
             %strong.cred
               No
 
+        %li
+          %span.light Current sign-in IP:
+          %strong
+            - if @user.current_sign_in_ip
+              = @user.current_sign_in_ip
+            - else
+              never
+
         %li
           %span.light Current sign-in at:
           %strong
@@ -78,6 +86,14 @@
             - else
               never
 
+        %li
+          %span.light Last sign-in IP:
+          %strong
+            - if @user.last_sign_in_ip
+              = @user.last_sign_in_ip
+            - else
+              never
+
         %li
           %span.light Last sign-in at:
           %strong