Fixed PR13158 by adding a staprun signal handler so modules don't remain.

Fixed PR13158 by adding a staprun signal handler so modules don't remain.

* runtime/staprun/staprun.c (term_signal_handler): New function.
  (setup_term_signals): Ditto.
  (insert_stap_module): Remembers if insert_module() worked.
  (main): Call setup_term_signals().
* testsuite/systemtap.base/rename_module.exp: Made test case more robust
  by waiting on output from all stap scripts.
* testsuite/systemtap.base/pr13158.exp: New testcase.