Update FailedRunsNotificationCronJob to report more clearly

[evenicoulddoit]

• A failure_reported flag added to each log entry, which is used to avoid notifying users multiple times about the same failed job
• Uses >= to account for when the job in question has run multiple times before the notification job runs
• Allows for global settings config to redefine the default number of failures as well as the from and to emails
• Separates concerns to allow users to extend the notifier and report failures using a different method of their choosing
• Doesn't consider itself when iterating over jobs

[coveralls]

Coverage increased (+0.9%) to 90.698% when pulling c2f16d66cb16f93ccbe9212d0550a2e7f9e042d0 on HousekeepLtd:failed-notifications-improvements into 57bd91260bb658911880813dbac06f79483ac601 on Tivix:master.

[coveralls]

Coverage increased (+0.9%) to 90.698% when pulling c44e5525c607db4c93828b6ff720e78726fbd048 on HousekeepLtd:failed-notifications-improvements into 57bd91260bb658911880813dbac06f79483ac601 on Tivix:master.

[coveralls]

Coverage increased (+0.9%) to 90.698% when pulling cdb858a7073080ce5207b85b03ed0d77eaa02464 on HousekeepLtd:failed-notifications-improvements into 57bd91260bb658911880813dbac06f79483ac601 on Tivix:master.

[coveralls]

Coverage increased (+0.9%) to 90.698% when pulling c1e36143a9371f4b4fd23c21f0a6410ee7179e4e on HousekeepLtd:failed-notifications-improvements into 57bd91260bb658911880813dbac06f79483ac601 on Tivix:master.

[coveralls]

Coverage increased (+0.9%) to 90.698% when pulling c1e36143a9371f4b4fd23c21f0a6410ee7179e4e on HousekeepLtd:failed-notifications-improvements into 57bd91260bb658911880813dbac06f79483ac601 on Tivix:master.

[coveralls]

Coverage increased (+0.9%) to 90.698% when pulling c1e36143a9371f4b4fd23c21f0a6410ee7179e4e on HousekeepLtd:failed-notifications-improvements into 57bd91260bb658911880813dbac06f79483ac601 on Tivix:master.

[coveralls]

Coverage increased (+0.9%) to 90.698% when pulling c1e36143a9371f4b4fd23c21f0a6410ee7179e4e on HousekeepLtd:failed-notifications-improvements into 57bd91260bb658911880813dbac06f79483ac601 on Tivix:master.

[coveralls]

Coverage increased (+0.9%) to 90.698% when pulling c1e36143a9371f4b4fd23c21f0a6410ee7179e4e on HousekeepLtd:failed-notifications-improvements into 57bd91260bb658911880813dbac06f79483ac601 on Tivix:master.

[coveralls]

Coverage increased (+0.9%) to 90.698% when pulling fccc6df02d4c3febffcd369295e67d9a76eb87e1 on HousekeepLtd:failed-notifications-improvements into db4a5cc3c8eb289b306e4798761e11b7d63aae4c on Tivix:master.

[evenicoulddoit]

@sci-tab thanks for going through the PR, should have addressed all your comments

[coveralls]

Coverage increased (+1.4%) to 91.246% when pulling d66f0685d4b81ad0c7c5a47d3816fd27acdf2a39 on HousekeepLtd:failed-notifications-improvements into db4a5cc3c8eb289b306e4798761e11b7d63aae4c on Tivix:master.