Attempting to build images fails now with an error because of a change
in the signing key for Percona packages.
Quick summary copied from [1]
Percona .deb packages are signed with a key that uses an algorithm now
considered weak. Starting with the next release, Debian and Ubuntu
packages are signed with a new key that uses the much stronger SHA-512
algorithm. All future package release will also contain the new
algorithm.
It’s important that you add the new key before the next release.
[1] https://www.percona.com/blog/2016/10/13/new-signing-key-for-percona-debian-and-ubuntu-packages/
Change-Id: I0420193982ebc5c9922eb388adb85da1423ab3f0
357930d459