eNMS 3.21.3

• Add new plugins mechanism
• Fix bug help panel open when clicking a field or label
• Add error message in the logs when a service is run in per device mode but no devices have been selected.
• Add default port of 22 for TCP ping in ping service
• Disable edit panel on double-click for start/end services of a workflow
• Fix invalid request bug when pressing enter after searching the "add services to workflow" panel
• Forbid "Start", "End" and "Placeholder" for service names
• Fix Result in mail notification for run once mode
• Make Netmiko prompt command service a substitution string in the UI
• Fix wrong jump password when using a Vault
• Fix workflow results recursive display no path in results bug
• Improve "Get Result" REST endpoint: returns 404 error if no run found, run status if a run is found but there are
  no results (e.g job still running), and the results if the job is done.
• Remove wtforms email validator in example service following wtforms 2.3 release