Describe the bug
Multipass sometimes logs unrelated messages to stdout. When parsing stdout information, this can lead to undesirable behavior.

To Reproduce
Install multipass 1.5 for Windows.

Run multipass version

How, and what happened?

>multipass version 2>stderr.txt
multipass  1.5.0+win
multipassd 1.5.0+win

#####################################################

This is an experiment to attempt to make the provider independent of the operating system. The motivation is to be able to distribute it via the terraform registry (dmacvicar/terraform-provider-libvirt#747). As an experiment, it is not guaranteed that the changes will make into the main branch.

The strategy is to move from [libvirt-go](https://github.com/libvirt/libv

The virtual machine has been removed outside Ravada and its information is still in the db. But the virtual machine doesn't exist so it can't be removed.

When the base is removed, removing clones raises this error:
Can't call method "id_owner" on an undefined value at lib/Ravada/Domain.pm line 625.

We should add the seguent targets to travis pipeline:

• Ubuntu 20.04
• Ubuntu 20.04 - image without netplan
• Ubuntu 18.04
• Ubuntu 18.04 - image without netplan

Also we could add (nice to have)

• Centos 7.x
• Debian 9

There are some command line (e.g. --min-memory and --adj-memory for autoballooning, also --networking-model in #20) switches that are better to have also in the configuration file that not introduced yet.

So the idea is to have a configuration file that will set all Default("...") in parameters for kingpin.

the shared_storage_type terraform variable has been removed recently but some dead references can still be found throughout the project.

supersedes #286