This commit modifies the method assertSentToNode to confirm if the destination Mac address of
the message is the node's Mac address. Add method check_parent_request, check_parent_response,
check_child_id_request and check_child_id_request to command.py.
Add a fuction in node.py node_cli.py to node's address.
Add a module command to verify commands.
Spinel-cli.py doesn't request address for dhcp prefix now, so put
Cert_5_2_05_AddressQuery.py in XFAIL on ncp.