change WARNING to WARN

src/or/buffers.c

src/or/circuit.c

src/or/command.c

src/or/config.c

src/or/connection.c

src/or/connection_edge.c

src/or/connection_or.c

src/or/cpuworker.c

src/or/directory.c

src/or/dirserv.c

src/or/dns.c

src/or/main.c

src/or/onion.c

src/or/routers.c

src/or/test.c