[MERGE] Fix for #107593 (bzr unable to ask password with plink)

[John Arbash Meinel]

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Alexander Belchenko wrote:
| Alexander Belchenko has voted approve.
| Status is now: Semi-approved
| Comment:
| I think with this patch you also may want to re-enable auto-detection of
| plink vendor.
|

It seems that we still don't allow prompting the user if they need a
password. All they get is a more appropriate failure.

So I don't think we want to auto-select plink until we can cope with
that situation.

John
=:->

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