fixes #6512 - move valid notices routes inside resources block

In Rails 3.2.8, it's not seeing the previous notice route get_new as
being part of the engine.  Moving inside a resource block fixes that
problem.  I also removed 2 routes that aren't valid and shouldn't exist
anymore - note_count and auto_complete_search.
fixes #6329 - toggle label content view/puppet environment, toggle show/hide installation media on new host form
fixes #6592 / BZ 1118895 - Activation Keys UI: replace 'System' references

In the UI, System should be replaced with Content Host on both the
new & edit screens for activation keys.
fixes #6593 / BZ 1118897 - Host Collections - fix crosslink to edit env and view
Merge pull request #4419 from bbuckingham/issue-6593

fixes #6593 / BZ 1118897 - Host Collections - fix crosslink to edit env and view
Merge pull request #4418 from bbuckingham/issue-6592

fixes #6592 / BZ 1118895 - Activation Keys UI: replace 'System' references
Merge pull request #4325 from isratrade/6329

fixes #6329 - toggle label content view/puppet environment, toggle show/hide installation media on new host form
Merge pull request #4393 from stbenjam/6512-notices

fixes #6512 - move valid notices routes inside resources block