The RPC generator doesn't support returning list of object, this patch does
the work manually.
* daemon/remote.c:
Implement the server side handler remoteDispatchConnectListAllStoragePools
* src/remote/remote_driver.c:
Add remote driver handler remoteConnectListAllStoragePools.
* src/remote/remote_protocol.x:
New RPC procedure REMOTE_PROC_CONNECT_LIST_ALL_STORAGE_POOLS and
structs to represent the args and ret for it.
* src/remote_protocol-structs: Likewise.