Initialize all RPC fields in adb::store.
Initialize all RPC fields in adb::store.

Valgrind nit.  Even if auxdata is not used for an adb, we should
still initialize its value in the RPC call.

sit/dht,weidezhang/dht,weidezhang/dht,weidezhang/dht,sit/dht,weidezhang/dht,sit/dht,weidezhang/dht,sit/dht,sit/dht