Always allow code coverage to be disabled

Allow code coverage to be disabled when specifying an explicit list
of packages.
Fix 'kube apply' panic on nil items

Bug 1146024 - https://bugzilla.redhat.com/show_bug.cgi?id=1146024
Merge pull request #158 from ironcladlou/configurable-cover-flag

Merged by openshift-bot
Merge pull request #146 from VojtechVitek/config_nil_items

Merged by openshift-bot
Fix a typo

invalid comma
Merge pull request #159 from fuleili/patch-1

Merged by openshift-bot