Yikun Jiang c2f7d65858 Add host/hostId to instance action events API
This patch adds a new microversion to
``GET /servers/{server_id}/os-instance-actions/{req_id}`` API to
include the ``host`` field for admin and an ``hostId`` for all users
by default. And the display of newly added ``host`` field will be
controlled by the same policy as the ``traceback`` field.

The newly added fields can be used to determine on which host a
given action event occurred.

Part of blueprint: add-host-to-instance-action-events

Change-Id: I2f8b4a12a088b9ed96b428eafde2e0c478fb1db5
2018-04-26 14:17:02 +00:00
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