Fix false-positives for pkgbuild.built state
Fix false-positives for pkgbuild.built state

No checking was being done when packages failed to build, the state
would just return a True result. This adds a post-build check to see if
any of the desired packages are not present, and returns a False result
if the desired packages are not present.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt