1.15.2
Use <mm0:alternates> during repomd.xml download (RhBug: 1019103)
Add unittests for mirrorlist module.
PGP: Update test vectors
py: unittests: Add metalink.xml and mirrorlist files. (RhBug: 954294)
Add zchunk tests
Add mirrorlist and metalink.xml files for unittest from previous commit.
repoconf: Add support for failover and skip_if_unavailable options
tests: Add tests for repoconfig module