* Some users rely on the presence of the root error related to
running an action and it's not convenient that it is now in
the end of the string, e.g. if we look at the corresponding
task execution "state_info" field. This patch includes the cause
error message in the beginning of the resulting error string
returned by the action executor so that it's clearly visible.
This message can be also truncated in some cases (depending on
the config option) so we need to make sure we keep the cause
error message.
Closes-Bug: #1847984
Change-Id: Ieb10c10401380410665c418f4688681e929b1e23
8f02e8a7d7