Werk #10759: agent_jira, jira_workflow, jira_custom_svc: New special agent and checks to gather statistics from Jira instances

With this special agent and checks, it's possible to query given projects and there workflows. This will result in one service per project and workflow that outputs the number of issues. Furthermore, you can define custom Jira Query Language (JQL) searches with different options on the result. Therefore, you have to define a service description for the resulting check and what result you expect (the count of found issues or the summed up or average values of a given numeric field). It's also possible to limit the number of processed results.

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