allow users with reserve permission on secret systems to see them

Bug: 1066586
Change-Id: I3d8dc495ce7e7b62f87c57a99440038f7ed037ba
beaker-repo-update: add missing trailing slash to base URL

Change-Id: Ic90bd7eff143bdfdcb3395a4676f1011b8218395
Merge branch 'release-0.15' into develop

Updated the test case for bug 1066586 to reflect the fact that 0.16+ has
an explicit 'view' permission.

Conflicts:
	IntegrationTests/src/bkr/inttest/server/selenium/test_csv_export.py
	IntegrationTests/src/bkr/inttest/server/selenium/test_system_search.py
	Server/bkr/server/model.py