Previously, we skipped everything that got invoked from
options_init_from_torrc.  But some of the stuff in
options_act_reversible and options_act is actually important, like
reopening the logs.

Now, a SIGHUP always makes the effects of an options_set() happen,
even though the options haven't changed.

Fix for bug 5095; bugfix on 0.2.1.9-alpha, which introduced
__ReloadTorrcOnSIGHUP.