some issues in /etc/init.d/dnsmasq

[e9hack]

Hi,

I found a few issues in /etc/init.d/dnsmasq

- variable EXTRA_MOUNT must be reset at beginning of dnsmasq_start to avoid to add the previous content to the following configurations
- /dev/null must be jail mount read/write (see the next too)
- jail mount for /dev/null and /dev/random isn't necessary because it will be jail mount automatically
- depend on parameter ignore_hosts_dir, the host-file itself or the directory of the host-file must be jail mount

Regards,
Hartmut