Bunch of fixes and an improvement

[skylord123]

Thanks for this great module! I decided to contribute to fix a few things and add a feature I've been needing. This is all completely backwards compatible.

• Fixes [SECURITY VULNERABILITY]: No permission checks against http routes #58
  • Security vulnerability I found while fixing other stuff. These routes should be checking for flows.write permission instead of letting anyone hit them.
• Fixes [FEAT]: List available containers on docker host #57
  • This was already implemented and I didn't know it. Looks like the code needed to be updated. It now works.
• Fixes [BUG]: Configuring docker container node gives error for createoptions and startOptions #55
  • This has been happening to me for a while now. Fresh install dragging new container action node always returns validation error.
• Closes [FEAT]: Allow returning full output instead of stream for docker run #54
  • The full output can now be returned by enabling a checkbox in the config (instead of returning a stream which can be annoying to deal with when not necessary)