Rename hosting directory for openolt repo.

Change-Id: I0f7f80515f1c165dc1fa068ae7a6399a8cfa4edf
diff --git a/default.xml b/default.xml
index 3fed0ce..9b71ac9 100644
--- a/default.xml
+++ b/default.xml
@@ -89,6 +89,6 @@
     <linkfile src="." dest="incubator/voltha/chameleon"/>
 </project>
 <project path="incubator/voltha" name="voltha" groups="incubation,voltha"/>
-<project path="incubator/voltha/voltha/adapters/openolt/openolt" name="openolt" groups="incubation,voltha"/>
+<project path="incubator/voltha/voltha/adapters/openolt/core" name="openolt" groups="incubation,voltha"/>
 
 </manifest>