azure: coredump: Wait for systemd fully booted
    
    Otherwise, 'Check for coredumps' task fails with:
    ```
    Verifying        : samba-debugsource-2:4.14.4-0.fc34.x86_64             20/20
    [Errno 2] No such file or directory: '/var/lib/dnf/rpmdb_lock.pid'
    Finishing: Check for coredumps
    ```
    
    This is due to systemd-tmpfiles(not ready yet).
    
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>