CA-401242: avoid long-running, idle connections on VDI.pool_migrate, backport #6103
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When a VDI.pool_migrate starts at a pool member, a connection between the coordinator and that host remains open for the duration of the migration. This connection is completely idle. If the migration lasts for more than 12 hours, stunnel closes the connection due to inactivity, which cancels the migration.
To avoid this use an internal API that uses short-running connection whenever possible to avoid interrupting the migration.
merged cherry-pick of 0149ee5