librpc/idl: Add dnsp_DnsProperty_short

This will be used by a test and the DNS server code to parse short dnsProperty
records which come from Windows servers.

This example is from the value that caused Samba to fail as it
can not be parsed as a normal dnsp_DnsProperty

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14310

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>

python/samba/tests/blackbox/ndrdump.py

@@ -468,3 +468,24 @@ dump OK
         # check_output will return bytes
         # convert expected to bytes for python 3
         self.assertRegex(actual.decode('utf8'), expected + '$')
+
+    def test_ndrdump_short_dnsProperty(self):
+        expected = b'''pull returned Success
+    dnsp_DnsProperty_short: struct dnsp_DnsProperty_short
+        wDataLength              : 0x00000000 (0)
+        namelength               : 0x00000000 (0)
+        flag                     : 0x00000000 (0)
+        version                  : 0x00000001 (1)
+        id                       : DSPROPERTY_ZONE_NS_SERVERS_DA (146)
+        data                     : union dnsPropertyData(case 0)
+        name                     : 0x00000000 (0)
+dump OK
+'''
+        command = (
+            "ndrdump dnsp dnsp_DnsProperty_short struct --base64-input "
+            "--input AAAAAAAAAAAAAAAAAQAAAJIAAAAAAAAA")
+        try:
+            actual = self.check_output(command)
+        except BlackboxProcessError as e:
+            self.fail(e)
+        self.assertEqual(actual, expected)