Add retry to virtual nodes; I was not retrying virtual nodes (like I
do physical nodes) cause I figured that indicated a fatal error and no point trying. But, it appears that jail setup is a bit flaky, and so I will retry ones that failed, once more. Note that I look at the cancel flag before doing the retry to avoid more pointles waiting! I have not actually tested this path through the code; just verified that the main path still functions okay!
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