Rename shippable test results directory

[Martin Krizek]

Since we switched to AZP we can rename the directory

ansibullbot/pytest.ini

Line 2 in 3bf317f

 addopts = -v -rxXs --doctest-modules --ignore=tests/utils --ignore=tests/manual --junitxml=shippable/testresults/pytest.xml --cov=ansibullbot --cov-report term-missing:skip-covered --cov-report xml:shippable/codecoverage/pytest-cov.xml 

https://github.com/ansible/ansibullbot/blob/master/azure-pipelines.yml