Fix AbcTest.testAbstract assertion

[park-junha]

Fixes the following test failure:

======================================================================
FAIL: testAbstract (__main__.AbcTest)
testAbstract (__main__.AbcTest)
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TypeError: Can't instantiate abstract class AbstractModule with abstract method __call__

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/buildfarm/default/operations/52eafc82-3509-47a0-ad8a-d565ef4de86b/bazel-out/k8-opt/bin/tensorflow/python/module/module_test.runfiles/org_tensorflow/tensorflow/python/module/module_test.py", line 340, in testAbstract
    AbstractModule()  # pylint: disable=abstract-class-instantiated
AssertionError: "Can't instantiate .* abstract methods" does not match "Can't instantiate abstract class AbstractModule with abstract method __call__"

----------------------------------------------------------------------

[mdanatg]

Thank you for the fix!

[mdanatg]

It would be ok to me to drop the regex altogether - knowing that a TypeError is raised is more than sufficient for this test.

[park-junha]

@mdanatg FYI - there's a couple instances of assertRaisesRegex in this test suite, I can remove them all if you'd like?

[mdanatg]

Sounds good. Only those asserts that verify messaged produced by module.py itself should use regexps.

[park-junha]

@mdanatg seems like this particular test was the only assert that didn't need a regexp assert, so I went ahead and removed it for that test only.

[rthadur]

@park-junha can you please check sanity build failures ?

[byronyi]

@park-junha can you please check sanity build failures ?

They look like transient failures. Mind to kick off CI again?