Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Add a new application setting, after_sign_up_text. This is text to be
rendered as Markdown and shown on the 'almost there' page after a user
signs up, but before they've confirmed their account.

Tweak the styles for that page so that centered lists look reasonable.

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

When an admin changes a user's password for them, force the user to
reset the password after logging in by expiring the new password
immediately.

and drop exception handling around HealthCheck::Utils.process_checks, it wasn't needed

delete the enabled_oauth_sign_in_sources after getting it's value into enabled_oauth_sign_in_sources

just delete enabled_oauth_sign_in_sources and get it's value

On Application Settings Page let the user select the enabled OAuth Sign in sources instead of the disabled ones

Also added a health check page to the admin section for resetting the token.

Closes gitlab-org/gitlab-ee#536

Codestyle changes to easy EE merge

This allows users to configure the number of points stored in a single
UDP packet. This in turn can be used to reduce the number of UDP packets
being sent at the cost of these packets being somewhat larger.

The default setting is 1 point per packet so nothing changes for
existing users.

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

The SQL query was ambiguous and in this case we want to filter projects.

I’ve removed everything related to the feature based on this commit:
ce08f919f34fd8849834365

Resolves #10857.

`render nothing: true` has been deprecated.
For more information see [pr](https://github.com/rails/rails/pull/20336)