Jenkins cart: Add "unzip" dependency

The `bin/install` script depends on `unzip` being in the path, so the
specfile for this package should Require the `unzip` package.

Enterprise bug 1136706
https://bugzilla.redhat.com/show_bug.cgi?id=1136706
Merge pull request #5914 from dobbymoodge/BZ1136706

Merged by openshift-bot