[WIP][VM Agent] Support antctl for VM Agent #5472
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Currently, antctl is not supported for VM Agent and running antctl on VM Agent will be treated as controller mode which causes unexpected output.
This change introduces a new global flag called mode for antctl. It can be controller, agent, vm or flowaggregator. If the flag is not set, we will keep identifying mode by using environment vairables and Pod names like before. But if the flag is set, it has higer priority and the flag must be set for VM mode.
This patch also adjusts some commands for VM mode. Current supported commands and their example outputs are listed below.