Authenticate session with kerberos

[drepelov]

To access ubi-manifest server, requests session now needs to be authenticated using kerberos. The requests-kerberos library used for the authentication needs some base packages to be installed in order to work properly. Therefore this commit adds an Install base packages step in tox-test.yml otherwise the tests would fail.

Note: on Jenikins the tool runs on fedora-jenkins-minimal image, where those packages are already installed so I think no changes there should be necessary.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.77%. Comparing base (55f454d) to head (3a56f30).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #234 +/- ## ========================================== + Coverage 98.75% 98.77% +0.01% ========================================== Files 7 7 Lines 724 732 +8 ========================================== + Hits 715 723 +8 Misses 9 9 ```

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[drepelov]

run tests

[rbikar]

run tests

[rbikar]

@drepelov

As agreed, taking over this PR. I've added a couple of things that should good enough for further deployment with kerb. auth.

I don't expect jenkins tests to pass.