Fix LDAP authentication for Git HTTP access

Conflicts:
	CHANGELOG

CHANGELOG

@@ -1,3 +1,6 @@
+v 7.4.1
+  - Fix LDAP authentication for Git HTTP access
+
 v 7.4.0
   - Refactored membership logic
   - Improve error reporting on users API (Julien Bianchi)

lib/gitlab/ldap/authentication.rb

@@ -42,7 +42,7 @@ module Gitlab
       end
 
       def adapter
-        OmniAuth::LDAP::Adaptor.new(config.options)
+        OmniAuth::LDAP::Adaptor.new(config.options.symbolize_keys)
       end
 
       def config
@@ -68,4 +68,4 @@ module Gitlab
       end
     end
   end
-end
+end