Renaming 'exp' to 'incubator'.

Change-Id: I184f756b463dce31634410f4f3bf180cbe6c8adb
diff --git a/pom.xml b/pom.xml
index a000472..b015bdb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -48,7 +48,7 @@
         <module>drivers</module>
         <module>openflow</module>
         <module>apps</module>
-        <module>exp</module>
+        <module>incubator</module>
         <module>features</module>
         <module>tools/package/branding</module>
     </modules>