Do not wait until an ioslave is finished to update other ioslaves with the

internal meta-data information it sent. Otherwise, the internal meta-data
might not be available to newly created ioslaves.

Note that this improves commit e2d09958 and
is required to make the address spoofing security warning in kio_http work
properly for all kdewebkit based browsers.

CCBUG: 94867

(cherry picked from commit c76097820a11d6e7015c8395f704d79386edbde1)