bug#34413: 27.0.50; package-quickstart feature breaks SLIME/SLY

[Davor Rotim]

When enabling the new package-quickstart feature SLIME or SLY fail to load with 
the following message:

Debugger entered--Lisp error: (file-missing "Cannot open load file" "No such 
file or directory" "sly")
  #<subr autoload-do-load>((autoload "sly" "Start a Lisp implementation and 
connect to it.\n\n  ..." t nil) sly nil)
  apply(#<subr autoload-do-load> ((autoload "sly" "Start a Lisp implementation 
and connect to it.\n\n  ..." t nil) sly))
  autoload-do-load((autoload "sly" "Start a Lisp implementation and connect to 
it.\n\n  ..." t nil) sly)
  command-execute(sly)

Disabling this feature allows SLIME or SLY to start normally again.
Tested on GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.5) 
of 2019-02-10