tests: Skip EDNS test if the scapy version doesn't support it.

EDNS0ClientSubnet is quite a recent addition to scapy and not all
distros might already have a new enough version of scapy available.

Fixes: b7fe2c8 ("pinctrl: dns: Ignore additional records.")
Signed-off-by: Dumitru Ceara <dceara@redhat.com>
Acked-by: Ales Musil <amusil@redhat.com>
(cherry picked from commit dbca38f)

tests/ovn-macros.at

@@ -874,3 +874,9 @@ m4_define([HOST_HAS_LOW_CORES], [
 m4_define([NORTHD_PARALLELIZATION], [
     HOST_HAS_LOW_CORES([OVN_NORTHD_PARALLELIZATION_DUMMY], [OVN_NORTHD_PARALLELIZATION_NO_DUMMY])
 ])
+
+m4_define([OVN_CHECK_SCAPY_EDNS_CLIENT_SUBNET_SUPPORT],
+[
+    AT_SKIP_IF([test $HAVE_SCAPY = no])
+    AT_SKIP_IF([! echo "from scapy.layers.dns import EDNS0ClientSubnet" | python 2>&1 > /dev/null])
+])

tests/ovn.at

@@ -10877,7 +10877,7 @@ AT_CLEANUP
 
 OVN_FOR_EACH_NORTHD([
 AT_SETUP([dns lookup : EDNS])
-AT_SKIP_IF([test $HAVE_SCAPY = no])
+OVN_CHECK_SCAPY_EDNS_CLIENT_SUBNET_SUPPORT()
 ovn_start
 
 check ovn-nbctl ls-add ls \