dht: add logger to constructor

include/opendht.h

include/opendht/dht.h

include/opendht/dht_interface.h

include/opendht/dht_proxy_client.h

include/opendht/dhtrunner.h

include/opendht/log.h

include/opendht/log_enable.h

src/dht.cpp

src/dht_proxy_client.cpp

src/dhtrunner.cpp

src/log.cpp

tools/dhtnode.cpp

tools/tools_common.h