samples: net: dns_resolver: Add config options for tests

Make sure that we compile sanity checked application with
more config options in order to catch compile issues faster.
In this case DHCPv4 + debugging options are enabled for
sanity checker.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>

samples/net/dns_resolve/sample.yaml

@@ -1,8 +1,13 @@
 sample:
-  description: TBD
+  description: DNS resolver sample application
   name: DNS Resolver
+common:
+  harness: net
+  depends_on: netif
+  tags: net dns
 tests:
   test:
-    harness: net
-    depends_on: netif
-    tags: net dns
+    extra_configs:
+      - CONFIG_NET_DHCPV4=y
+      - CONFIG_NET_DEBUG_APP=y
+      - CONFIG_SYS_LOG_NET_LEVEL=4