Add details on using a principal for the admin
    
    When Ipsilon is being installed with IPA, one is most likely going
    to use Kerberos to login to Ipsilon as the administrator.  We should
    call this out, as the default of 'admin' for the Ipsilon admin user
    will conflict with the IPA 'admin' user.  You will be unable to
    create a local 'admin' user at this point, requiring you to modify
    the sqlite database directly to change the admin user to a full
    principal.
    
    I also corrected a typo and wrapped a line that was > 79 chars.
    
    Signed-off-by: Nathan Kinder <nkinder@redhat.com>
    Reviewed-by: Simo Sorce <simo@redhat.com>