#155450742 Add scheduler collection

[Ashaba]

What does this PR do?

It enables background scheduling

Description of Task to be completed?

The front end runs concurrently with background process to check for scheduled checks and runs them.
This updates the database on completion

How should this be manually tested?

• Install all the requirements in the requirements.txt
• Start redis redis-server
• Start the celery beat celery beat -A celery_worker.celery --loglevel=info
  Ensure to update the config at this stage CELERY_IMPORTS = ("application.monitoring_tasks",)
• Start the celery worker celery worker -A celery_worker.celery --loglevel=info
• Add a collection and its duration of 1 minute
• Add requests to the collection and wait for the 1 minute.
  Apparently the UI is not updated automatically, on refreshing the page, results should show on the dashboard.

Any background context you want to provide?

These checks are currently testing only status code and the response time

What are the relevant pivotal tracker stories?

155450742

Screenshots (if appropriate)

[coveralls]

Pull Request Test Coverage Report for Build 228

• 105 of 154 (68.18%) changed or added relevant lines in 21 files are covered.
• 10 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.5%) to 38.136%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
application/base_model.py	3	4	75.0%
application/monitoring_tasks.py	24	32	75.0%
application/views.py	10	20	50.0%
application/helpers.py	11	41	26.83%

Files with Coverage Reduction	New Missed Lines	%
application/base_model.py	1	72.73%
venv/lib/python3.6/site-packages/jinja2/environment.py	9	44.08%

Totals
Change from base Build 222:	0.5%
Covered Lines:	32467
Relevant Lines:	85134

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💛 - Coveralls