Comment # 19 on bug 1100134 from Dominique Leuenberger

We have a small 'issue' here; pkcon returns retval 5 for two cases:

* PK_ERROR_ENUM_ALL_PACKAGES_ALREADY_INSTALLED
* PK_ERROR_ENUM_REPO_NOT_AVAILABLE

man pkcon declares retval 5 as:

       5 Nothing useful was done.

(until recently, package already installed return transaction failed; this was
fixed upstream to actually match the man page)

For QA though this means we don't know when we encounter a 'already installed'
or deeper error that things did not work. This is why we currently flag to many
tests as softfail