Enable the ntor handshake on the client side.

src/or/channeltls.c

src/or/circuitbuild.c

src/or/circuitbuild.h

src/or/circuituse.c

src/or/config.c

src/or/entrynodes.c

src/or/nodelist.c

src/or/nodelist.h

src/or/or.h

src/or/relay.c

src/or/router.c

src/or/routerparse.c