9d28946395
Serialising/deserialising exceptions in python follows the protocol defined by pickle. It relies on the base Exception.__init__ setting self.args, and later resurrects exceptions with class(*args). This change rewrites processutils.ProcessExecutionError so it survives a pickle.dumps/loads round-trip. Change-Id: I9b8d104f60df868be7b808c72c932d08f1752777