Revert "socket: if we fail to create an instantiated service for a socket, don't...

Revert "socket: if we fail to create an instantiated service for a socket, don't put the socket in failure mode"

This reverts commit 9586cdfab6a2638078702b7fea7e16b3a71899e2.
(but not the TODO hunk).

The bug was already fixed by 1a710b43. And if other errors occur, we
don't want to leave the socket active in order to avoid having socket
tarpits.