Warn about invalid package keys

Merge with atpkg:warn_package
Status Job ID Name Coverage
  Build
passed #1667
docker
linux

00:01:11

passed #1668
openswift
osx

00:00:15

passed #1664
docker
linux

00:01:11

failed #1662
docker
linux

00:00:00

passed #1663
openswift
osx

00:00:17