LDAP: Use first value instead of joined one for uid, cn

lib/gitlab/ldap/group.rb

@@ -16,7 +16,7 @@ module Gitlab
       end
 
       def cn
-        entry.cn.join(" ")
+        entry.cn.first
       end
 
       def name

lib/gitlab/ldap/person.rb

@@ -20,11 +20,11 @@ module Gitlab
       end
 
       def name
-        entry.cn.join(" ")
+        entry.cn.first
       end
 
       def uid
-        entry.send(config.uid).join(" ")
+        entry.send(config.uid).first
       end
 
       def username