fixes #6603 / BZ 1115341 - content search - fix for missing package metadata

This commit is to address errors that could occur if the package
metadata was missing information for fields such as, provides,
requires, files or changelog.
fixes #6719 / BZ 1079953 - Content Notices - fix deletion and list by org

This commit addresses 2 issues w/ the content notices page:
1. list only the notices associated with the current org
2. update so that clicking 'Delete All' will render the confirmation dialog
fixes #6596 - fixes #6596 - change 'type' method to 'system_type' in Katello::System
Merge pull request #4469 from bbuckingham/issue-6719

fixes #6719 / BZ 1079953 - Content Notices - fix deletion and list by org
Merge pull request #4423 from bbuckingham/issue-6603

fixes #6603 / BZ 1115341 - content search - fix for missing package metadata
Merge pull request #4421 from isratrade/6596

fixes #6596 - change 'type' method to 'system_type' in Katello::System