Convert bool-like string arguments to actual bool

[alexAubin]

The problem

I need to be able to send a boolean argument 'force':True (equivalent to --force) from the webadmin in the context of a POST request.

However, turns out that transmitting booleans in POST data is not 100% trivial since only strings are transmitted anyway. So far we did not need such a thing...

Proposed solution

I could do some dirty hack in my command API but that wouldnt be pretty for CLI users ... So instead I propose this fix were, if an arg looks like a boolean (i.e. "true" or "false") it is converted to True/False

[zamentur]

If someone try to put false or true as a password, i think it will display a warning and put password as password ...
https://github.com/YunoHost/moulinette/blob/stretch-unstable/moulinette/actionsmap.py#L114

[zamentur]

@alexAubin What about this one ?

[alexAubin]

Meh, i dunno, YunoHost/yunohost-admin#209 is in standby while we progress on other things so we'll see... But to me the edge case of "someone putting 'true' in a password field" doesnt convice me :/

(But agreed that my current PR is a bit dirty and hackish)

[alexAubin]

Hmokay let's forget about this 😅 I must have missed something but it seems possible to pass booleans during GET requests and DELETE requests so must be possible somehow to do it in a POST request...

Will reopen if needed