Added BUCK file for SNMP provider.

Change-Id: If43023ca0d69adeef17680fa6b67e86b6aea490f
diff --git a/modules.defs b/modules.defs
index cf92e27..3e83f70 100644
--- a/modules.defs
+++ b/modules.defs
@@ -99,6 +99,7 @@
     '//providers/openflow/app:onos-providers-openflow-app-oar',
     '//providers/rest:onos-providers-rest-oar',
     '//providers/isis:onos-providers-isis-oar',
+    '//providers/snmp:onos-providers-snmp-oar',
 ]
 
 ONOS_APPS = [