use dnsutils image in one test instead of awk on all the tests.

test/630_proxy_dns_test.sh

@@ -11,8 +11,8 @@ start_suite "Proxy registers containers with dns"
 
 weave_on $HOST1 launch-dns 10.2.254.1/24
 weave_on $HOST1 launch-proxy --with-dns
-proxy docker_on $HOST1 run -e WEAVE_CIDR=$C2/24 -dt --name=c2 -h $C2_NAME $SMALL_IMAGE /bin/sh
-proxy docker_on $HOST1 run -e WEAVE_CIDR=$C1/24 -dt --name=c1             $DNS_IMAGE   /bin/sh
+proxy docker_on $HOST1 run -e WEAVE_CIDR=$C2/24 -dt --name=c2 -h $C2_NAME $DNS_IMAGE /bin/sh
+proxy docker_on $HOST1 run -e WEAVE_CIDR=$C1/24 -dt --name=c1             $DNS_IMAGE /bin/sh
 
 assert_dns_record $HOST1 c1 $C2_NAME $C2
 assert_dns_record $HOST1 c2 $C1_NAME $C1

test/config.sh

@@ -128,7 +128,7 @@ assert_dns_record() {
 
     [ -z "$DEBUG" ] || greyly echo "Checking whether the IPs '$@' exists at $host:$container"
     for ip in "$@" ; do
-        assert "exec_on $host $container getent hosts $ip | awk '{print \$2}'" "$name"
+        assert "exec_on $host $container getent hosts $ip | tr -s ' '" "$ip $name"
     done
 }