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Minor changes in monitoring protocol
Change msg field to messages in monitoring messages with typeimage-helper and subtype error or warning. The new field is a listof strings.
Get unbuffered input in helper-monitor.py
Change sys.stdin.readline with os.read
Prefix all monitoring message types with image-
Fix some error messages
Add helper-monitor.py program
This program transforms raw helper monitor messages into json stringsunder very strict rules. This reduces security concerns since thehelper VM output cannot be trusted.