Can't disable facts on `zpe.nodegrid.managed_devices` module

[m-hau]

The zpe.nodegrid.managed_devices module has a parameter called facts, which needs to be a boolean, is required and defaults to False.

In the subsequent option execution check, that parameter is checked using is not None, and because it is a required parameter (aka it can't be None) this check will always succeed and collect the facts. Setting it to True or False makes no difference.

I found this issue because of #65 I was using verbose mode most of the time, and collecting the facts produces a lot of output which I wanted to reduce (but couldn't).