Introduce new --local-service=host parameter

Similar to local-service, but more strict. Listen only on localhost
unless other interface is specified. Has no effect when interface is
provided explicitly. I had multiple bugs fillen on Fedora, because I have
changed default configuration to:

interface=lo
bind-interfaces

People just adding configuration parts to /etc/dnsmasq.d or appending to
existing configuration often fail to see some defaults are already there.
Give them auto-ignored configuration as smart default.

Signed-off-by: Petr Menšík <pemensik@redhat.com>

Do not add a new parameter on command line. Instead add just parameter
for behaviour modification of existing local-service option. Now it
accepts two optional values:
- net: exactly the same as before
- host: bind only to lo interface, do not listen on any other addresses
  than loopback.

src/dnsmasq.h

@@ -281,7 +281,8 @@ struct event_desc {
 #define OPT_NORR           69
 #define OPT_NO_IDENT       70
 #define OPT_CACHE_RR       71
-#define OPT_LAST           72
+#define OPT_LOCALHOST_SERVICE  72
+#define OPT_LAST           73
 
 #define OPTION_BITS (sizeof(unsigned int)*8)
 #define OPTION_SIZE ( (OPT_LAST/OPTION_BITS)+((OPT_LAST%OPTION_BITS)!=0) )