Log into the Web UI as another user

https://fedorahosted.org/freeipa/ticket/3064

Reviewed-By: Petr Vobornik <pvoborni@redhat.com>
Chapter 5 (Users): Remove trailing whitespace

Reviewed-By: Martin Basti <mbasti@redhat.com>
Chapter 5 fixed images, examples, added new TIPs

 - Fixed screenshots
 - Edited how to enable/disable account
 - Added reference how to configure SSSD with SSH keys in FreeIPA
 - New TIP how to find private groups
 - Fixed tables with schemas
 - Replaced CSV
 - Added trust admins group into list of deafault groups
 - Fixed outputs of commands

 - New TIP: exetended group searching
   https://fedorahosted.org/freeipa/ticket/3842

Reviewed-By: Petr Viktorin <pviktori@redhat.com>