Move LDAP tests to proper location

Same patch as gitlab-ce
https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/1053

lib/gitlab/ldap/adapter.rb

@@ -110,7 +110,8 @@ module Gitlab
       end
 
       def dn_matches_filter?(dn, filter)
-        ldap_search(base: dn, filter: filter, scope: Net::LDAP::SearchScope_BaseObject, attributes: %w{dn}).any?
+        ldap_search(base: dn, filter: filter,
+          scope: Net::LDAP::SearchScope_BaseObject, attributes: %w{dn}).any?
       end
 
       def ldap_search(*args)

spec/lib/gitlab/ldap/user_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Gitlab::LDAP do
+describe Gitlab::LDAP::User do
   let(:gl_auth) { Gitlab::LDAP::User }
 
   before do