Comment # 2 on bug 987774 from Andreas Stieger

zypper lp/lu are read-only operations, so non-root users are fine to run it.
What they cannot do is refresh repositories and - apparently - mount repos.

In my view the bug is INVALID as filed: There is no problem with normal users
running zypper.

The bug would only be valid if it relates to the problem that a user cannot
perform a mount, and a solution/message would need to be found for that.