Fix log-uninitialized-stack bug in rend_service_intro_established.

Fixes bug 23490; bugfix on 0.2.7.2-alpha.

TROVE-2017-008
CVE-2017-0380
rend_hsdir_routers_changed(void)
{
  consider_republishing_rend_descriptors = 1;
}

rend_hsdir_routers_changed(void)
{
  consider_republishing_rend_descriptors = 1;
}
