[ONOS-6760][ONOS-6761] RESTCONF changes and fixes

* bug fixes for POST and PUT
* added support for PATCH
* added support for RPC

Change-Id: Ib03dd1e92d4e7231851340063eb23e4b3ad582cf
diff --git a/protocols/restconf/server/rpp/BUCK b/protocols/restconf/server/rpp/BUCK
index 6531f88..7eaf628 100644
--- a/protocols/restconf/server/rpp/BUCK
+++ b/protocols/restconf/server/rpp/BUCK
@@ -3,6 +3,7 @@
     '//lib:jersey-client',
     '//lib:jersey-server',
     '//lib:javax.ws.rs-api',
+    '//lib:servlet-api',
     '//utils/rest:onlab-rest',
     '//apps/restconf/api:onos-apps-restconf-api',
 ]