Garbage collector not delete old sessions
Call Artisan dump-autoload after session:table
Cast found session to object.
Merge pull request #4671 from lucasmichot/4.2-db-session-dump-autoload

[4.2] Session:  Call Artisan dump-autoload after session:table
Merge pull request #4662 from szekeresa/patch-1

Garbage collector not delete old sessions
Fix check.