Infra has updated the cert that serves hg.python.org. If you have
hardcoded the fingerprint in your slave's hg config you'll need
to update it to:
31:d8:79:0f:ca:b5:c4:76:85:ba:61:84:e7:5b:52:4f:78:7d:38:3e
At least one buildbot seems to be affected by this (PPC64LE Fedora).
--David