Removed deprecated null provider sub-modules.

Change-Id: I154bdbc5eb27ce79ae5428ec6dc01b1dc09be8b0
diff --git a/providers/null/pom.xml b/providers/null/pom.xml
index fa1b6d3..e6d417d 100644
--- a/providers/null/pom.xml
+++ b/providers/null/pom.xml
@@ -29,7 +29,7 @@
     <artifactId>onos-null-provider</artifactId>
     <packaging>bundle</packaging>
 
-    <description>ONOS null protocol adapters</description>
+    <description>Null southbound providers application</description>
 
     <dependencies>
         <dependency>