[0.19] psbt: handle unspendable psbts #17853

1. 
   luke-jr commented at 4:05 AM on January 3, 2020: member

   Backport of #17524

2. Have a PSBTAnalysis state that indicates invalid PSBT

   Invalid PSBTs need to be re-created, so the next role is the
   Creator (new PSBTRole). Additionally, we need to know what went
   wrong so an error field was added to PSBTAnalysis.
   
   A PSBTAnalysis indicating invalid will have empty everything,
   next will be set to PSBTRole::CREATOR, and an error message.
   
   Github-Pull: #17524
   Rebased-From: 638e40cb6080800c7b0a7f4028f63326acbe4700

   551583398b
3. Mark PSBTs spending unspendable outputs as invalid in analysis

   Github-Pull: #17524
   Rebased-From: 773d4572a4864ab7b6380858d07d9579ff6dd9a2

   ca5f8deefd
4. fanquake added the label Backport on Jan 3, 2020
5. fanquake added this to the milestone 0.19.1 on Jan 3, 2020
6. fanquake requested review from achow101 on Jan 3, 2020
7. 
   achow101 commented at 4:41 PM on January 3, 2020: member

   ACK ca5f8deefd778195cb10a3419d3b5c0693abb958

   Diff is the same.

8. fanquake referenced this in commit febf04841f on Jan 4, 2020
9. fanquake merged this on Jan 4, 2020
10. fanquake closed this on Jan 4, 2020

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11. DrahtBot locked this on Feb 15, 2022

Review Requested
achow101

Milestone
0.19.1