Keep descriptor rotation time after HUP occurs.

changes/bug26932

@@ -0,0 +1,3 @@
+  o Minor bugfixes (onion services):
+    - Fix bug that causes services to not ever rotate their descriptors if they
+      were getting SIGHUPed often. Fixes bug 26932; bugfix on 0.3.2.1-alpha.

src/or/hs_service.c

@@ -845,6 +845,7 @@ move_hs_state(hs_service_t *src_service, hs_service_t *dst_service)
     replaycache_free(dst->replay_cache_rend_cookie);
   }
   dst->replay_cache_rend_cookie = src->replay_cache_rend_cookie;
+  dst->next_rotation_time = src->next_rotation_time;
 
   src->replay_cache_rend_cookie = NULL; /* steal pointer reference */
 }