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This is an attempt to reduce the overhead and DDS discovery issues associated with starting multiple controllers with the spawner. See #1934 for some background.
In this PR, we save off the service client in spawner for reuse for subsequent controllers so we're not creating a new service client for each controller. This change improves the performance and reduces the failures when starting multiple controllers at a time.
There may be a better way to do this so please comment.
Also, this PR conflicts with #1944 and may not require that PR anymore.