fafdad0d4 qa: Remove unused NodeConn members (MarcoFalke)
Pull request description:
* `ver_send` and `ver_recv` were completely unused
* `rpc` was only used once, in p2p-segwit. Imo better only pass it to the constructor in that single test
Tree-SHA512: 7f85554d6d0fd2096516ca3c608811d5370da66cde35d8031bdc921607a7a4efdb26355896012f75f713f8df09e28d46ba46be69fd96a5898fabb1a25cbcb8ad