Python executor: Execution command and prepare environment log
Also fix error messages return when something goes wrong.

Issue-ID: CCSDK-1404
Signed-off-by: Steve Siani <alphonse.steve.siani.djissitchi@ibm.com>
Change-Id: Ifff396d8cee8d6608b6fb32d3a8e941a253ba24c
2 files changed