Pass a valid UserInfo to the login callback

The sess.UserInfo is still unset at that stage, use valid information
instead. This fixes a bug where keys were not being unlocked for users.
4 jobs for master in 2 minutes and 56 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build Pkgsrc
passed #14139
build_pkgsrc:stretch

00:00:11

 
  Build Pkg
passed #14140
amd64
build_pkg:stretch:amd64

00:00:30

passed #14141
arm64
build_pkg:stretch:arm64

00:02:17

 
  Upload Pkg
passed #14142
upload_pkg

00:00:27