Clear all control.c flags on control_free_all()

Fixes bug 25512.

changes/bug25512

+  o Minor bugfixes (restart-in-process):
+    - When shutting down, Tor now clears all the flags in the control.c
+      module. This should prevent a bug where authentication cookies
+      are not generated on restart. Fixes bug 25512; bugfix on 0.3.3.1-alpha.
+

src/or/control.c

@@ -7602,6 +7602,11 @@ control_free_all(void)
   bootstrap_percent = BOOTSTRAP_STATUS_UNDEF;
   notice_bootstrap_percent = 0;
   bootstrap_problems = 0;
+  authentication_cookie_is_set = 0;
+  global_event_mask = 0;
+  disable_log_messages = 0;
+  memset(last_sent_bootstrap_message, 0, sizeof(last_sent_bootstrap_message));
+  flush_queued_event_pending = 0;
 }
 
 #ifdef TOR_UNIT_TESTS