update gitignore so 'repo status' is clean

Change-Id: Ia004f22e478ec7719f31612b5a6655d715cdc03a
diff --git a/.gitignore b/.gitignore
index 11a3368..cf82f35 100644
--- a/.gitignore
+++ b/.gitignore
@@ -47,3 +47,5 @@
 apps/mcast/
 apps/olt/
 apps/vtn/
+apps/carrierethernet/
+