face: change default separator for ethernet::Address::toString() to ':'

Change-Id: I4c8d2e90bd0279cc6221ec58790de19d656f4ca3
diff --git a/daemon/core/face-uri.cpp b/daemon/core/face-uri.cpp
index 442837b..5da35cd 100644
--- a/daemon/core/face-uri.cpp
+++ b/daemon/core/face-uri.cpp
@@ -134,7 +134,7 @@
   : m_isV6(false)
 {
   m_scheme = "ether";
-  m_host = address.toString(':');
+  m_host = address.toString();
 }
 #endif // HAVE_PCAP