[Koha] koha ugrade from 3.22.21 to 19.05.17

[George Mikuchadze]

I've upgraded empty koha(on ubuntu 18.04) from 3.22.21 to 19.05.17 using
only the tarball file(without sudo apt-get install koha-common).
Everything was nice - until I tried to login intranet site with a super
admin account after a successful web installer procedure of upgrading the
koha tables:  "Error: Invalid username or password". I checked the
koha-conf.xml file and the username and password were unchanged! What
happened with koha - did the Memcached server change the settings?

George Mikuchadze
National Scientific Library of Georgia