v1.9.1

Summary

v1.9.1 is a maintenance release, with 2 fixes:

1. Certain build config is accidently deleted, causing git version and commit_id
   being missed from the software binary. This is a quick fix to restore that info
   so delegate nodes can correctly report the binary version they are running.
2. ioctl node delegate command can correctly show all probated delegates now.

Upgrade Priority

All delegate nodes must upgrade in order to correctly report the binary version
they are running.

Node type	Action
Delegate	Must upgrade
Fullnode	Not required

Commits In This Release

1. update docker build command #3751
2. [ioctl] use candidate.OperatorAddress to show probated delegates #3727