Some users have reported that reloading dnsmasq does not always work. It
sometimes stop responding to DNS lookup requests after being reloaded.
This patch changes "safe-search-maintenance" so that it restarts dnsmasq
instead of reloading it.

Signed-off-by: Gregory L. Dietsche <gregory.dietsche@cuw.edu>

Ensure that the best available IP is always used for all supported
safe-search providers. This is accomplished by periodically checking
DNS for the most recent list of IP addresses associated with each
provider.

Signed-off-by: Gregory L. Dietsche <gregory.dietsche@cuw.edu>