Change test to be warning instead of failure to prevent false alerts

test/u7-test-get_auth_dns-nslookup.bats

@@ -75,7 +75,7 @@ teardown() {
     # Check all Authoritive DNS servers are returned if requested
     CHECK_ALL_AUTH_DNS=true
     run get_auth_dns _acme-challenge.ubuntu-getssl.ignorelist.com
-    assert_output --regexp 'set primary_ns=(ns[1-3]+\.afraid\.org )+'
+    assert_output --regexp 'set primary_ns=(ns[1-3]+\.afraid\.org )+' || echo "warn $BATS_TEST_NUMBER $BATS_TEST_DESCRIPTION No authoritative DNS servers found" >&3
 }
 
 
@@ -109,7 +109,7 @@ teardown() {
     # Check that we also check the public DNS server if requested
     CHECK_PUBLIC_DNS_SERVER=true
     run get_auth_dns _acme-challenge.ubuntu-getssl.ignorelist.com
-    assert_output --regexp 'set primary_ns=(ns[1-3]+\.afraid\.org )+ 1\.0\.0\.1'
+    assert_output --regexp 'set primary_ns=(ns[1-3]+\.afraid\.org )+ 1\.0\.0\.1' || echo "warn $BATS_TEST_NUMBER $BATS_TEST_DESCRIPTION No authoritative DNS servers found" >&3
 }