Add exit_code, stdout, stderr etc to ProcessExecutionException
Add exit_code, stdout, stderr etc to ProcessExecutionException

This means that we can now catch ProcessExecutionException and inspect the result, in order to handle "acceptable" exceptions e.g. file does not exist on a remove

Change-Id: I4f5dfe1f1d4601dafc50abc4c61f4b616f13c5ff

citrix-openstack-build/oslo.versionedobjects,openstack/oslo.versionedobjects