Merge branch 'register-tab' into 'master'

Only show register tab if signup enabled.

## What does this MR do?

Fixes a regression where the register tab is activated, even if sign-up enabled is not activated in application_settings.

## Screenshots (if relevant)

When signup is disabled: 

![Screen_Shot_2016-10-22_at_8.56.23_PM](/uploads/bd0fa5f27114779c0d290a8151c1c253/Screen_Shot_2016-10-22_at_8.56.23_PM.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) entry added
- [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/23654

See merge request !7058

1 files changed, 3 insertions, 2 deletions

diff --git a/app/views/devise/shared/_tabs_normal.html.haml b/app/views/devise/shared/_tabs_normal.html.haml
index 79b1d447a92..05246303fb6 100644
--- a/app/views/devise/shared/_tabs_normal.html.haml
+++ b/app/views/devise/shared/_tabs_normal.html.haml
@@ -1,5 +1,6 @@
 %ul.nav-links.new-session-tabs.nav-tabs{ role: 'tablist'}
   %li.active{ role: 'presentation' }
     %a{ href: '#login-pane', data: { toggle: 'tab' }, role: 'tab'} Sign in
-  %li{ role: 'presentation'}
-    %a{ href: '#register-pane', data: { toggle: 'tab' }, role: 'tab'} Register
+  - if signin_enabled? && signup_enabled?
+    %li{ role: 'presentation'}
+      %a{ href: '#register-pane', data: { toggle: 'tab' }, role: 'tab'} Register