Hpcc 11648 fix

HPCC-11648 ecl-test.json server section being ignored

Reorganise ecl-test.json to store individual IP address for each cluster

Fix cluster IP handling problem.

Change queryWuid() and abortWorkunit() functions to use extended ECl tool.

Implement local IP query function.

Add Regression Test Engine IP address to OriginalTextFilesIp stored variable
for Setup. (Without this the remotely executed setupsearchindex.ecl doesn't
find the external data file)

Update README.rst

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>