net: wait until the node is destroyed to delete its recv buffer
net: wait until the node is destroyed to delete its recv buffer

when vRecvMsg becomes a private buffer, it won't make sense to allow other
threads to mess with it anymore.

dagurval/bitcoinxt,bitcoinxt/bitcoinxt,bitcoinxt/bitcoinxt,bitcoinxt/bitcoinxt,dagurval/bitcoinxt,dagurval/bitcoinxt,dagurval/bitcoinxt,bitcoinxt/bitcoinxt,bitcoinxt/bitcoinxt,bitcoinxt/bitcoinxt,dagurval/bitcoinxt,dagurval/bitcoinxt