util: DummyClientFace can override processEvents

refs #3769

Change-Id: Idf8b674ed238f296c7c4293b19a6f769cbd7e332
diff --git a/src/face.cpp b/src/face.cpp
index bbb9f08..d20f57c 100644
--- a/src/face.cpp
+++ b/src/face.cpp
@@ -439,7 +439,7 @@
 }
 
 void
-Face::processEvents(const time::milliseconds& timeout, bool keepThread)
+Face::doProcessEvents(const time::milliseconds& timeout, bool keepThread)
 {
   if (m_ioService.stopped()) {
     m_ioService.reset(); // ensure that run()/poll() will do some work