Build failures on master?!

[Dr. Matthias St. Pierre]

The last 19 commits on https://github.com/openssl/openssl/commits/master,
starting from Nov 14 have a red cross from the CIs. What's going on again?
My personal impression is that builds on master are failing 50% of the time.

It is really tedious to check pull requests for build errors just to find that those errors
are well known failures from master. In particular, the krb5 an pyca tests are notoriously
failing. Are there any plans to fix them or disable them?

  95-test_external_krb5.t     (Wstat: 256 Tests: 1 Failed: 1)
  95-test_external_pyca.t     (Wstat: 256 Tests: 1 Failed: 1)

Clean builds on master should have highest priority. Because if there are too many red
crosses, nobody cares about them anymore.

Matthias