connect_connection_command): New static commands, replacing
make_simple_connect and make_connect_connection. Updated users.

Rev: src/io_commands.c:1.47
Rev: src/io_commands.h:1.22
Rev: src/lsh.c:1.149
Rev: src/lsh_proxy.c:1.26
Rev: src/tcpforward_commands.c:1.37