cloudberry checkberry gpcheckperf series updates are used to solve the problem that cbdb 1.5.2 version gpcheckperf does not display disk information

fix https://github.com/cloudberrydb/cloudberrydb/issues/421 cbdb 1.5.2 version gpcheckperf does not display disk information

Change logs

Changes to fix gpcheckperf failure with an exception when sometime time command output has a comma separator instead of a dot.
Before this patch, while running gpcheckperf utility the buffer was set by default for the underlying gpnetbenchClient utility as 32Kb. It led to problem with receiving annoying and misleading warnings about connections between hosts. Use '--buffer-size' flag with size in kilobytes to set buffer size, which will be used at gpnetbenchClient. It is an optional parameter. The default value is 8Kb.
Update gpcheckperf makefile README.md from greenplum 2 cbdb & add gpshrink & gpdemo based on the greenplum gpcheckperf command parameter and function call update.

etc.

Why are the changes needed?

The open source database gp has made a series of updates to the gpcheckperf tool, including

Replace scp with rsync
.Fixing gpcheckperf failure on -V with -f optio
gpcheckperf: Fix memory calculation function
gpcheckperf - Update a Python 3 reference of "python" to "python3"
gpcheckperf: incorporating parity changes from 6X PR
gpcheckperf: fixing string parsing in parseMultiDDResult()
gpcheckperf: add buffer size parameter
Fixing if the time command has comma in the output

Does this PR introduce any user-facing change?

no

How was this patch tested?

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May 10 '24 04:05 August-beaulo

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1 out of 5 committers have signed the CLA.

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:x: Annu149
:x: piyushc01
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