Comment 11 for bug 1582950

Actually on the live session the hook reads /var/log/syslog which has read access for the group adm and after installation it reads /var/log/installer/syslog which does not and the code path is different.
In the former case decoding of utf8 bytes object is already done (the file is read with the function read()) but not in the latter (the file is the output of the command 'cat')