Repair destinations end-to-end in repair command

Previously, the SSH 'repair' command copied packs to all destinations
first and then issued a single replication start for the project. A
failure during the copy phase still left a replication attempt queued
for the affected destination, which is not desired. Rework the command
to drive one destination at a time so that the follow-up replication
is only triggered when its preceding pack copy succeeds.

Change-Id: Ibcc8cd5ee8a005b0c29d4fe9f4f8e1af96524d32