dnsmasq: fix service reload

The SIGHUP also got sent to the reload script making it bail out
with an error

Revert "dnsmasq: reload config if host name is modified"
This reverts commit 854459a2.

Reported-by: Hans Dedecker <dedeckeh@gmail.com>
Signed-off-by: John Crispin <john@phrozen.org>