Feature/hasupport

STATUS: NOT READY

Track changes / corrections that needs to be done.

Once ready, we'll merged.

Working:
- When assigning "High-availability" to the "Management" interface, it is saved in pf.conf. There is still an issue (see number 1)
Remove 1 space between "Comiting" and "changes"
Also, "Commiting" should be read "Committing"