timer: Add now() for timer_set

core/reactor.cc

@@ -335,7 +335,7 @@ future<> reactor_backend_epoll::timers_completed() {
 void reactor::complete_timers() {
     timers_completed().then(
             [this] () {
-        _expired_timers = _timers.expire(clock_type::now());
+        _expired_timers = _timers.expire(_timers.now());
         for (auto& t : _expired_timers) {
             t._expired = true;
         }

core/timer-set.hh

@@ -237,6 +237,10 @@ public:
     {
         return _non_empty_buckets.none();
     }
+
+    time_point now() {
+        return Timer::clock::now();
+    }
 };
 
 #endif