Remove dead code in hostwatch.py
Remove dead code in hostwatch.py

11 years ago in commit 384d0e7c1d637c4c36eb3e4d31d538bc9420d987,
hostwatch was updated to use netstat to find hosts, and
_check_smb()/_check_nmb() were edited to immediately return. This
patch removes all of the unused code in these two functions.

sshuttle/sshuttle,sshuttle/sshuttle