Release version 2018.06.28

Shortlog of commits since last release:

    Jeremy Audet (10):
          Drop unittest from @require
          Drop unittest from @skip_if
          Drop unittest from Pulp 2 require_* utils
          Drop unittest from @require_pulp_plugins
          Make pagination tests faster
          Drop unittest from @require_pulp_3
          Update BaseAPITestCase deprecation warning
          Add deprecation warning to BaseAPICrudTestCase
          Update Python test and constants
          Test last_override_config, drop a BaseAPITestCase

    Kersom (1):
          Add basic test coverage to pagination.

VERSION

@@ -1 +1 @@
-2018.06.21
+2018.06.28