Add we_are_fully_hibernating() to distinguish hibernation states

We want to tell "shut down" from "shutting down".

src/or/hibernate.c

@@ -877,13 +877,26 @@ hibernate_begin_shutdown(void)
   hibernate_begin(HIBERNATE_STATE_EXITING, time(NULL));
 }
 
-/** Return true iff we are currently hibernating. */
+/**
+ * Return true iff we are currently hibernating -- that is, if we are in
+ * any non-live state.
+ */
 MOCK_IMPL(int,
 we_are_hibernating,(void))
 {
   return hibernate_state != HIBERNATE_STATE_LIVE;
 }
 
+/**
+ * Return true iff we are currently _fully_ hibernating -- that is, if we are
+ * in a state where we expect to handle no network activity at all.
+ */
+MOCK_IMPL(int,
+we_are_fully_hibernating,(void))
+{
+  return hibernate_state == HIBERNATE_STATE_DORMANT;
+}
+
 /** If we aren't currently dormant, close all connections and become
  * dormant. */
 static void

src/or/hibernate.h

@@ -25,6 +25,7 @@ void accounting_add_bytes(size_t n_read, size_t n_written, int seconds);
 int accounting_record_bandwidth_usage(time_t now, or_state_t *state);
 void hibernate_begin_shutdown(void);
 MOCK_DECL(int, we_are_hibernating, (void));
+MOCK_DECL(int, we_are_fully_hibernating,(void));
 void consider_hibernation(time_t now);
 int getinfo_helper_accounting(control_connection_t *conn,
                               const char *question, char **answer,