the default hasn't been changed since 2009
this can improve our test performances
nixos/tests: remove explicit memorySize <1024
1024MiB is now the default
- remove check for `connected .JID: focus@auth.server` because
- log format was changed in c1945ea6cb
- connection.getUser() in jicofo also appears to be broken, returning null instead of username
- testing for this log line shouldn't be necessary, as we also test for "Authenticated as focus@auth.server"
- remove check for `External component successfully authenticated` because
- [JVB no longer uses component](https://community.jitsi.org/t/jvb-not-connecting/91157/2)
- increase VM memory
