executeOn setting is available for PostBuildStep
since 2.0 version of the Post Build Script plugin.
For previous plugin's version executeOn should be
set on the PostBuildScript layer.
Change-Id: I6b7c9ccfbd0a2d610499074675835e6b5d96cb17
Task: 39028
Story: 2007411
Updates the PostBuildScript plugin to support the 2.x version which
had a major overhaul of the XML output for the plugin.
Change-Id: I9ff3161bc50be236013e32f3ca9ad81b38004dc8
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>