Test suite fails on rpm tests

[csams]

____________________________________________________________________________ VersionCompareTest.test_from_rpmtest _____________________________________________________________________________

self = <rpm_vercmp.tests.vercmp_test.VersionCompareTest testMethod=test_from_rpmtest>

    def test_from_rpmtest(self):
        parser = ACParser(self.acfobj, with_buggy_comparisons=True)
        test_count = 0
        for first, second, exp in parser:
            test_count += 1
            ret = rpm_vercmp.vercmp(first, second)
>           self.assertEqual(exp, ret)
E           AssertionError: 1 != 0

rpm_vercmp/tests/vercmp_test.py:104: AssertionError

The failure happens for "1.0^" and "1.0"

Maybe due to these commits?

[vzhestkov]

Fix is in #3

[pombredanne]

@csams @vzhestkov FYI, I have a vendored version in https://github.com/nexB/univers/pull/14/files#diff-97b9f0952bb8a18ddc6f0a366b1f8fb41fffdfd58b63f0938903b15044e4d7bb that fixes this issue.
It includes updates from @snarkmaster @justintrudell in https://github.com/facebookincubator/antlir/blob/5a105d1ba94f031f31cdf50c53e89c5b252f2b1f/antlir/rpm/rpm_metadata.py

@adoom42 this is also fixing #4