Switch sd_event loops to sdeventplus

This change is mostly focused around plumbing the sdeventplus::Event
object everywhere and using the member functions provided for the event.
No migration to the timer utility is performed yet.

Change-Id: I912ab82bc081239d3b7c3cf7c5caca6742ef9c87
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/timer.cpp b/timer.cpp
index 6929717..36057ab 100644
--- a/timer.cpp
+++ b/timer.cpp
@@ -32,16 +32,15 @@
 using InternalFailure = sdbusplus::xyz::openbmc_project::Common::
                             Error::InternalFailure;
 
-Timer::Timer(phosphor::fan::event::EventPtr& events,
+Timer::Timer(const sdeventplus::Event& event,
              std::function<void()> callbackFunc) :
-    timeEvent(events),
     callback(callbackFunc),
     timeout(0)
 {
     sd_event_source* source = nullptr;
 
     // Start with an infinite expiration time
-    auto r = sd_event_add_time(timeEvent.get(),
+    auto r = sd_event_add_time(event.get(),
                                &source,
                                CLOCK_MONOTONIC, // Time base
                                UINT64_MAX,      // Expire time - way long time