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If an exception occurs in hostwatch, sshuttle exits. Problems read/writing the ~/.sshuttle.hosts cache file on the remote machine would therefore cause sshuttle to exit. With this patch, we simply continue running without writing/reading the cache file in the remote home directory. This serves as an alternate fix for pull request #322 which proposed storing the cache file elsewhere. A list of included changes: - If we can't read or write the host cache file on the server, continue running. Hosts can be collected through the netstat, /etc/hosts, etc and the information can be reconstructed each run if a cache file isn't available to read. We write a log() message when this occurs. - Add additional types of exceptions to handle. - Continue even if we cannot read /etc/hosts on the server. - Update man page to mention the cache file on the remote host. - Indicate that messages are related to remote host instead of local host. - Add comments and descriptions to the code.