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c951578fca
Prior to this commit, ReplicationHandler had a few inconsistencies
in how it reported errors:
- Sometimes the 'status' field was used as an enum (e.g. 'success'
v. 'failure'. Elsewhere it is used to hold error messages.
- Sometimes an explicit 'message' field was used, but often not.
- Sometimes a stack trace was provided in place of an error message.
This commit tweaks the various error cases in ReplicationHandler to
report errors consistently. 'status' is always an enum-type value. A
'message' field is provided for all errors, with an optional 'exception'
field.