add return value to IvasBuildAndRunChecks.py

from pyivastest import ivas_svn

RET_CODE_FAILURE = 101

class IvasBuildAndRunChecks(IvasScriptsCommon.IvasScript):

    def __init__(self):

        super().__init__(

                self.args["create_complexity_tables"]

            )

        for check in checks:

            runner = br.build_and_run_dict[check]["runner"]

            failed_encs = runner.failed_modes["enc"]

            failed_decs = runner.failed_modes["dec"]

            if len(failed_encs) > 0 or len(failed_decs) > 0:

                return RET_CODE_FAILURE

            else:

                return 0

if __name__ == "__main__":

    script = IvasBuildAndRunChecks()

    script.run()

    sys.exit(script.run())