Revert "Disable U2F"

This reverts commit cdda055c
3 jobs for revert-cdda055c in 5 minutes and 5 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Build
passed #5998
build_bionic

00:02:16

passed #5997
build_stretch

00:02:23

 
  Sign
passed #5999
sign

00:00:25