pxf
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Restrict PXF cluster commands can only be run on the Greenplum coordinator
In this PR:
- Check if
pxf clustercommands are running on the Greenplum coordinator by looking for the coordinator data directory. Error out and exit when the cluster commands are running on the segments - Unit tests for mocking cluster commands are running on the coordinator and segments
- Update the README about how to debug the unit tests with
dlv