[MEDIUM] session: remove s->prev_srv which is not needed anymore

[MEDIUM] session: remove s->prev_srv which is not needed anymore

s->prev_srv is used by assign_server() only, but all code paths leading
to it now take s->prev_srv from the existing s->srv. So assign_server()
can do that copy into its own stack.

If at one point a different srv is needed, we still have a copy of the
last server on which we failed a connection attempt in s->target.