Allow to connect using OTP 2FA

[V-Paranoiaque]

Sorry there was a mistake in my previous PR. If the OTP 2FA is activated the client gets a timeout.
I have added the environment var PM_OTP to connect using the 2FA.

[sticky-note]

There is an issue on this PR.
When we enter a blank value, we get this error

provider.proxmox.pm_otp
  OTP 2FA code (if required)

  Enter a value: 


Error: Missing required attribute

  on <input-prompt> line 1:
  (source code not available)

The attribute "pm_password" is required, but no definition was found.


Error: Missing required attribute

  on <input-prompt> line 1:
  (source code not available)

The attribute "pm_user" is required, but no definition was found.


Error: Missing required attribute

  on <input-prompt> line 1:
  (source code not available)

The attribute "pm_api_url" is required, but no definition was found.

[V-Paranoiaque]

Hello,
I haven't be able to fix the problem for the moment.
Have you tried to add the parameter pm_otp to your terraform file?