Now when Mogan manage the baremetal node from driver,
Mogan didn't know it is a managed server.
We need add this information "managed_server=True" to
system metadata for internal use.
So this patch will finish two jobs:
1. Implements the system metadata in Mogan
2. Add manageable server information into system metadata
Co-Authored-By: Xinran WANG <xin-ran.wang@intel.com>
Change-Id: I89947796e120d89ec56f8f5daeb9774cf15b6bd0
Implements: blueprint system-metadata
Closes-Bug: #1727913