GPDB CLI utilities rewrite

[Roman Shaposhnik]

Hi!

just wanted to let you guys know that there's a pretty
lively discussion going on about re-writing GPDB
CLI in Go:
    https://groups.google.com/a/greenplum.org/forum/#!topic/gpdb-dev/d3mVgVFdB-8

This may be interesting to HAWQ devs since there's
a lot of similarity at the CLI level.

Thanks,
Roman.