testNS and testNSD fails in autopkgtest environment

[Benjamin Drung]

testNS and testNSD from py3dns 4.0.0-1 fails in the autopkgtest environment:

```
======================================================================
ERROR: testNS (DNS.tests.test_base.TestBase.testNS)
Lookup NS record from SOA
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/autopkgtest.dyUpM7/build.c2R/src/DNS/tests/test_base.py", line 158, in testNS
    resp = dnsob.qry(qtype='NS',server=primary,aa=1)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/autopkgtest.dyUpM7/build.c2R/src/DNS/Base.py", line 274, in qry
    self.sendUDPRequest(server)
  File "/tmp/autopkgtest.dyUpM7/build.c2R/src/DNS/Base.py", line 370, in sendUDPRequest
    raise first_socket_error
  File "/tmp/autopkgtest.dyUpM7/build.c2R/src/DNS/Base.py", line 347, in sendUDPRequest
    r=self.processUDPReply()
      ^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/autopkgtest.dyUpM7/build.c2R/src/DNS/Base.py", line 137, in processUDPReply
    raise TimeoutError('Timeout')
DNS.Base.TimeoutError: Timeout

======================================================================
ERROR: testNSD (DNS.tests.test_base.TestBase.testNSD)
Lookup NS record from SOA
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/autopkgtest.dyUpM7/build.c2R/src/DNS/tests/test_base.py", line 250, in testNSD
    resp = dnsob.req(qtype='NS',server=primary,aa=1, timeout=1)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/autopkgtest.dyUpM7/build.c2R/src/DNS/Base.py", line 323, in req
    self.sendUDPRequest(server)
  File "/tmp/autopkgtest.dyUpM7/build.c2R/src/DNS/Base.py", line 370, in sendUDPRequest
    raise first_socket_error
  File "/tmp/autopkgtest.dyUpM7/build.c2R/src/DNS/Base.py", line 347, in sendUDPRequest
    r=self.processUDPReply()
      ^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/autopkgtest.dyUpM7/build.c2R/src/DNS/Base.py", line 137, in processUDPReply
    raise TimeoutError('Timeout')
DNS.Base.TimeoutError: Timeout

----------------------------------------------------------------------
```

These test succeed in a local schroot autopkgtest. Probably the network setup in the Ubuntu autopkgtest environment let these test fail.

[Heinrich Schuchardt (xypron)]

Extending the timeout period (timerout=30) does not resolve the issue.

[Scott Kitterman (kitterman)]

This is a downstream issue.

[Scott Kitterman (kitterman)]

The tests work fine in Debian. I'd suggest you just drop the tests in Ubuntu is the network is insufficient in your environment.