Description of problem:
Version of tasks in 6.7 uses 'foreman_tasks/tasks' as controller name for bookmarks, but Satellites <6.7 used 'foreman_tasks_tasks'.

This has several outcomes:
1) The user cannot see the default bookmarks we ship
2) The user can CRUD new bookmarks, we will need to take care of this when fixing this.
3) If the user upgraded from previous release, they won't be able to see any of their old bookmarks.

Version-Release number of selected component (if applicable):
tfm-rubygem-foreman-tasks-0.17.5.2-1.el7sat.noarch

How reproducible:
Always

Steps to Reproduce:
1. Go to tasks index
2. Run the following on satelltie to get counts of bookmarks
foreman-rake console <<EOF
%w(_ /).each do |separator|
  controller = 'foreman_tasks' + separator + 'tasks'
  puts "#{controller}: #{Bookmark.where(:controller => controller).count}"
end
EOF

3. Click the bookmark button next to the search bar
4. Create a new bookmark
5. Rerun command from 2.


Actual results:
There are no bookmarks in step 3, although data from step 2 say there should be some. In the output of step 5, we can see the number of bookmarks assigned with foreman_tasks/tasks goes up.

Expected results:
Bookmarks we ship and bookmarks user created before upgrade are shown there. In the output of step 5, we can see the number of bookmarks assigned with foreman_tasks_tasks goes up, foreman_tasks/tasks is zero.