dnsmasq: avoid forwarding queries without a domain

dnsmasq is forwarding a number of queries upstream that should not
be done.  There still remains an MX query for a plain name with no
domain specified that will be forwarded is dnsmasq has --domain=xxx
--local=/xxx/ specified. This does not happen with no domain name
and --local=// ... not a libvirt problem.

BTW, thanks again to Claudio Bley!
(cherry picked from commit f3868259)

Conflicts:
	AUTHORS

AUTHORS

@@ -241,6 +241,7 @@ Patches have also been contributed by:
   Thang Pham           <thang.pham@us.ibm.com>
   Eiichi Tsukata       <eiichi.tsukata.xh@hitachi.com>
   Wido den Hollander   <wido@widodh.nl>
+  Gene Czarcinski      <gene@czarc.net>
 
   [....send patches to get your name here....]
 

src/network/bridge_driver.c

@@ -491,7 +491,11 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
     virCommandAddArgList(cmd, "--strict-order", "--bind-interfaces", NULL);
 
     if (network->def->domain)
-        virCommandAddArgList(cmd, "--domain", network->def->domain, NULL);
+        virCommandAddArgPair(cmd, "--domain", network->def->domain);
+    /* need to specify local even if no domain specified */
+    virCommandAddArgFormat(cmd, "--local=/%s/",
+                           network->def->domain ? network->def->domain : "");
+    virCommandAddArgList(cmd, "--domain-needed", "--filterwin2k", NULL);
 
     if (pidfile)
         virCommandAddArgPair(cmd, "--pid-file", pidfile);

tests/networkxml2argvdata/isolated-network.argv

-@DNSMASQ@ --strict-order --bind-interfaces --conf-file= \
+@DNSMASQ@ --strict-order --bind-interfaces \
+--local=// --domain-needed --filterwin2k --conf-file= \
 --except-interface lo --dhcp-option=3 --no-resolv \
 --listen-address 192.168.152.1 \
 --dhcp-range 192.168.152.2,192.168.152.254 \

tests/networkxml2argvdata/nat-network-dns-hosts.argv

-@DNSMASQ@ --strict-order --bind-interfaces --domain example.com \
+@DNSMASQ@ --strict-order --bind-interfaces --domain=example.com \
+--local=/example.com/ --domain-needed --filterwin2k \
 --conf-file= --except-interface lo --listen-address 192.168.122.1 \
 --expand-hosts --addn-hosts=/var/lib/libvirt/dnsmasq/default.addnhosts\

tests/networkxml2argvdata/nat-network-dns-srv-record-minimal.argv

 @DNSMASQ@ \
 --strict-order \
 --bind-interfaces \
---conf-file= \
+--local=// --domain-needed --filterwin2k --conf-file= \
 --except-interface lo \
 --srv-host=name.tcp.,,,, \
 --listen-address 192.168.122.1 \

tests/networkxml2argvdata/nat-network-dns-srv-record.argv

 @DNSMASQ@ \
 --strict-order \
 --bind-interfaces \
---conf-file= \
+--local=// --domain-needed --filterwin2k --conf-file= \
 --except-interface lo \
 --srv-host=name.tcp.test-domain-name,.,1024,10,10 \
 --listen-address 192.168.122.1 \

tests/networkxml2argvdata/nat-network-dns-txt-record.argv

-@DNSMASQ@ --strict-order --bind-interfaces --conf-file= \
+@DNSMASQ@ --strict-order --bind-interfaces \
+--local=// --domain-needed --filterwin2k --conf-file= \
 --except-interface lo --txt-record=example,example value \
 --listen-address 192.168.122.1 --listen-address 192.168.123.1 \
 --listen-address 2001:db8:ac10:fe01::1 \

tests/networkxml2argvdata/nat-network.argv

-@DNSMASQ@ --strict-order --bind-interfaces --conf-file= \
+@DNSMASQ@ --strict-order --bind-interfaces \
+--local=// --domain-needed --filterwin2k --conf-file= \
 --except-interface lo --listen-address 192.168.122.1 \
 --listen-address 192.168.123.1 --listen-address 2001:db8:ac10:fe01::1 \
 --listen-address 2001:db8:ac10:fd01::1 --listen-address 10.24.10.1 \

tests/networkxml2argvdata/netboot-network.argv

-@DNSMASQ@ --strict-order --bind-interfaces --domain example.com \
---conf-file= --except-interface lo --listen-address 192.168.122.1 \
+@DNSMASQ@ --strict-order --bind-interfaces --domain=example.com \
+--local=/example.com/ --domain-needed --filterwin2k --conf-file= \
+--except-interface lo --listen-address 192.168.122.1 \
 --dhcp-range 192.168.122.2,192.168.122.254 \
 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/netboot.leases \
 --dhcp-lease-max=253 --dhcp-no-override --expand-hosts --enable-tftp \

tests/networkxml2argvdata/netboot-proxy-network.argv

-@DNSMASQ@ --strict-order --bind-interfaces --domain example.com \
---conf-file= --except-interface lo --listen-address 192.168.122.1 \
+@DNSMASQ@ --strict-order --bind-interfaces --domain=example.com \
+--local=/example.com/ --domain-needed --filterwin2k --conf-file= \
+--except-interface lo --listen-address 192.168.122.1 \
 --dhcp-range 192.168.122.2,192.168.122.254 \
 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/netboot.leases \
 --dhcp-lease-max=253 --dhcp-no-override --expand-hosts \

tests/networkxml2argvdata/routed-network.argv

-@DNSMASQ@ --strict-order --bind-interfaces --conf-file= \
+@DNSMASQ@ --strict-order --bind-interfaces \
+--local=// --domain-needed --filterwin2k --conf-file= \
 --except-interface lo --listen-address 192.168.122.1\