-added statistics-only option for `execution-get-report`
command, which will only return statistics of an execution.
-modified "print_statistics":
*in case of statistics-only,there is no need to print execution
tree.
*print a new field "estimated time".
Implements: blueprint mistral-executions-report-return-statistics-only
Depends-on: I7038d6d2a48f9f0455545f6be8dce33a48b25e1c
Change-Id: I77f9120ea1f1d4469772f67be334921fe4f7862f
Signed-off-by: ali <ali.abdelal@nokia.com>
72a72eb31c