To prevent screwing up terminal settings on windows when printing to the terminal, turn off the virtual termial before print out to console. The file call these funtions are from scp.c, sftp.c and sshconnect(calls smprintf). The virtual termial are not enabled in scp and sftp. turn off it in vfmprintf is enough for now.
1. Deploy the key files to separate folder to avoid overwriting.
2. Enable hostkeys and kex unit tests.
3. Generate debug info in pdb
4. minor update on snmprintf
