Tolerate old machine images, but warn they should be recreated

[n1hility]

Fixes #13510

Machine instances created on podman 3 will be incompatible with podman current podman remote.
Let them run in a reduced mode and warn there will be problems and should be recreated.

Output:

Starting machine "podman-machine-default"
ERRO[0000] machine "podman-machine-default" is incompatible with this release of podman and needs to be recreated, starting for recovery only 
INFO[0000] waiting for clients...                       
INFO[0000] new connection from  to /var/folders/w6/95wf1cp50bz9rdm74r_pdyw40000gs/T/podman/qemu_podman-machine-default.sock 
Waiting for VM ...

!!! ACTION REQUIRED: INCOMPATIBLE MACHINE !!!

This machine was created by an older podman release that is incompatible
with this release of podman. It has been started in a limited operational
mode to allow you to copy any necessary files before recreating it. This
can be accomplished with the following commands:

	# Login and copy desired files (Optional)
	# podman machine ssh tar cvPf - /path/to/files > backup.tar

	# Recreate machine (DESTRUCTIVE!) 
	podman machine stop
	podman machine rm -f
	podman machine init --now

	# Copy back files (Optional)
	# cat backup.tar | podman machine ssh tar xvPf - 

Machine "podman-machine-default" started successfully

[NO NEW TESTS NEEDED]

[n1hility]

@baude not sure if you prefer this to outright fail on start.

[rhatdan]

I think this should fail. Won't podman blow up trying to communicate with the podman service within the VM? Or do you want to allow users to enter then VM via podman machine ssh, and update it?

[Luap99]

I think it would be good to allow it to start so users can ssh into it and save their data before nuking the machine.
If we fail to start this will be impossible and someone would need to manually mount the VM image just to save some files.

[n1hility]

Ok how about I change this to have a louder warning on start to that effect? It will say that the machine is no longer compatible and is starting only to allow you to copy your data off.

[rhatdan]

SGTM

[Luap99]

LGTM
We should backport this to 4.0

[n1hility]

@rhatdan @Luap99 PTAL i can submit a backport once ok.

[rhatdan]

/approve
/lgtm

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