Move sftp_nonblock.c to sftp_RW_nonblock.c, since it isn't just a non-blocking version of sftp.c.  It has different command line parameters and tries to do more
Move sftp_nonblock.c to sftp_RW_nonblock.c, since it isn't just a
non-blocking version of sftp.c.  It has different command line parameters
and tries to do more

libssh2/libssh2,libssh2/libssh2,libssh2/libssh2,libssh2/libssh2