FortiOS changes private key encryption every time config is downloaded

[anubisg1]

This is very similar to #931 and #1199

the following lines are not excluded from configurations and they change every time the config is pulled

set password ENC
set passphrase ENC
set key ENC
set secondary-key ENC
set server-key ENC

i'm running 0.30.1 (probalby newer, i have latest docker image)

[systeembeheerder]

config:

...
models:
  fortios:
    vars:
      remove_secret: true
...

works for me