Tailor number of delayed_jobs workers on util instances (ExamTime/#6571)

Also introduced a new 'clone' worker that will be responsible for
processing clone jobs.
These are shifted off the web servers to prevent server crashes due to
heavy clone operations.
Tailor number of delayed_jobs workers on util instances (ExamTime/#6571)

Also introduced a new 'clone' worker that will be responsible for
processing clone jobs.
These are shifted off the web servers to prevent server crashes due to
heavy clone operations.
Merge branch 'issue-6571' of github.com:ExamTime/ey-cloud-recipes into issue-6571

Conflicts:
	cookbooks/delayed_job/recipes/default.rb
Merge branch 'master' into issue-6571
Merge pull request #7 from ExamTime/issue-6571

Issue 6571