Use sdeventplus

Start using the sdeventplus event mechanisms so that future code
can take advantage of it for things like timers and other events.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I6ffe80266257bfd3512a5b848c47f5ccfb5206e8
diff --git a/configure.ac b/configure.ac
index 3139382..27175a5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -38,6 +38,7 @@
     # If we ever have a library, move this to private.
     AX_PKG_CHECK_MODULES([SDBUSPLUS], [sdbusplus])
     AX_PKG_CHECK_MODULES([PHOSPHOR_DBUS_INTERFACES], [phosphor-dbus-interfaces])
+    PKG_CHECK_MODULES([SDEVENTPLUS], [sdeventplus])
 
     # Check for sdbus++
     AC_PATH_PROG([SDBUSPLUSPLUS], [sdbus++])