Standby Director Agent's URI is changeable

Current Situation

• A Director Agent can include two instances that act as a cluster.
• The URL of the active Director Agent instance cannot be changed. This is desired behavior as the Director Agent instance actively orchestrates Subagents and cannot be interrupted or restarted.
• The URL of the standby Director Agent instance cannot be changed. This not desired behavior. It should be possible to migrate a standby Director Agent instance to a new host and/or protocol (http/https) and/or port.

Desired Situation

• Allow changing the URL in the standby Director Agent's SubagentItem.
• This allows users to migrate both Director Agent instances in a cluster from a three-step operation:
  • Migrate the first, standby Director Agent instance.
  • Perform switch-over between Director Agent instances.
  • Migrate the second, standby Director Agent instance.