HPCC-9337 --source-cluster option to specify where to copy data from

Add --source-cluster cli option to ecl-packagemap-add, ecl-publish,
and ecl-queries-copy to explicitly specify which cluster roxie should
pull data from when loading a query with CopyResources=true.

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>