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Andrea Spadaccini authored
To add status reporting for the KVM migration, the instance_migrate RPC
must be non-blocking. Moreover, there must be a way to represent the
migration status and a way to fetch it.

* constants.py:
  - add constants representing the migration statuses

* objects.py:
  - add the MigrationStatus object

* hypervisor/hv_base.py
  - change the FinalizeMigration method name to FinalizeMigrationDst
  - add the FinalizeMigrationSource method
  - add the GetMigrationStatus method

* hypervisor/hv_kvm.py
  - change the implementation of MigrateInstance to be non-blocking
    (i.e. do not poll the status of the migration)
  - implement the new methods defined in BaseHypervisor

* backend.py, server/noded.py, rpc.py
  - add methods to call the new hypervisor methods
  - fix documentation of the existing methods to reflect the changes

* cmdlib.py
  - adapt the logic of TLMigrateInstance._ExecMigration to reflect
    the changes

Signed-off-by: default avatarAndrea Spadaccini <spadaccio@google.com>
Reviewed-by: default avatarMichael Hanselmann <hansmi@google.com>
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