Fixed PR19275 by updating stap_run.

Fixed PR19275 by updating stap_run.

* testsuite/lib/stap_run.exp: The stap_run() function now fails if it
  receives any unexpected output. The 'all_pass_string' was modified to be
  only one copy of "systemtap test success" instead of allowing of
  multiple copies.
* testsuite/systemtap.base/array_slicing.exp: Handle stap_run
  changes. Also, fixed the test names so that they aren't '$test_name'.
* testsuite/systemtap.base/at_var_tracepoint.exp: Update for stap_run
  changes.
* testsuite/systemtap.base/at_var_tracepoint.stp: Ditto.
* testsuite/systemtap.base/be_order.stp: Ditto.
* testsuite/systemtap.base/div0.exp: Ditto.
* testsuite/systemtap.base/error_fn.exp: Ditto.
* testsuite/systemtap.base/global_init.stp: Ditto.
* testsuite/systemtap.base/global_var_kernel.exp: Ditto.
* testsuite/systemtap.base/global_vars.stp: Ditto.
* testsuite/systemtap.base/if.exp: Ditto.
* testsuite/systemtap.base/if.stp: Ditto.
* testsuite/systemtap.base/kprobes.exp: Ditto.
* testsuite/systemtap.base/logical_and.stp: Ditto.
* testsuite/systemtap.base/maxactive.exp: Ditto.
* testsuite/systemtap.base/pp.exp: Ditto.
* testsuite/systemtap.base/print.exp: Ditto.
* testsuite/systemtap.base/proc_by_pid.exp: Ditto.
* testsuite/systemtap.base/process_by_pid.exp: Ditto.
* testsuite/systemtap.base/procfs_maxsize.exp: Ditto.
* testsuite/systemtap.base/procfs_umask.exp: Ditto.
* testsuite/systemtap.base/stmt_counting.exp: Ditto.
* testsuite/systemtap.base/stmt_counting_functions.stp: Ditto.
* testsuite/systemtap.base/stmt_counting_straight.stp: Ditto.
* testsuite/systemtap.base/timers.exp: Ditto.
* testsuite/systemtap.base/tri.stp: Ditto.
* testsuite/systemtap.context/context_ns.exp: Ditto.
* testsuite/systemtap.context/pid_ns.stp: Ditto.
* testsuite/systemtap.context/usymfileline.exp: Ditto.
* testsuite/systemtap.printf/memory1.exp: Ditto.
* testsuite/systemtap.stress/current.exp: Ditto.