Handle testsuite 'spawn' calls correctly by calling 'close' and 'wait'.

Handle testsuite 'spawn' calls correctly by calling 'close' and 'wait'.

* testsuite/systemtap.base/auto_path.exp: Add 'close' and 'wait' calls
  after a 'spawn'.
* testsuite/systemtap.base/const_op.exp: Ditto.
* testsuite/systemtap.base/kallsyms.exp: Ditto.
* testsuite/systemtap.base/timeout.exp: Ditto.
* testsuite/systemtap.context/symbols.exp: Kill spawned stap process and
  call 'close' before calling 'wait'.
* testsuite/systemtap.base/flightrec1.exp: Fix location of close/wait
  calls.
* testsuite/systemtap.base/flightrec2.exp: Ditto.
* testsuite/systemtap.base/flightrec3.exp: Ditto.
* testsuite/systemtap.base/flightrec4.exp: Ditto.
* testsuite/systemtap.base/flightrec5.exp: Ditto.
* testsuite/systemtap.base/crash.exp: Call 'catch' around individual
  'close' and 'wait' calls.
* testsuite/systemtap.maps/foreach_fail.exp: Ditto.
* testsuite/systemtap.base/backtrace.exp: Call 'catch' around 'wait'
  calls.
* testsuite/systemtap.base/cache_clean.exp: Ditto.
* testsuite/lib/systemtap.exp (setup_server): Add 'catch' around 'exec'.
  (stap_run_batch): Call 'close' before calling 'wait'.
* testsuite/lib/stap_compile.exp (stap_compile): Call 'close' before
  calling 'wait'.
* testsuite/systemtap.base/alternatives.exp: Ditto.
* testsuite/systemtap.base/at_var_unresolved.exp: Ditto.
* testsuite/systemtap.base/at_var_unresolved_lvalue.exp: Ditto.
* testsuite/systemtap.base/at_var_void_stmt.exp: Ditto.
* testsuite/systemtap.base/bz10078.exp: Ditto.
* testsuite/systemtap.base/bz1074541.exp: Ditto.
* testsuite/systemtap.base/bz1126645.exp: Ditto.
* testsuite/systemtap.base/bz13338.exp: Ditto.
* testsuite/systemtap.base/cmd_parse.exp: Ditto.
* testsuite/systemtap.base/debugpath.exp: Ditto.
* testsuite/systemtap.base/deref2.exp: Ditto.
* testsuite/systemtap.base/func_alias.exp: Ditto.
* testsuite/systemtap.base/multisym.exp: Ditto.
* testsuite/systemtap.base/pr13158.exp: Ditto.
* testsuite/systemtap.base/pr13306.exp: Ditto.
* testsuite/systemtap.base/pr14546.exp: Ditto.
* testsuite/systemtap.base/prologues.exp: Ditto.
* testsuite/systemtap.base/pthread_stacks.exp: Ditto.
* testsuite/systemtap.base/rep_ret.exp: Ditto.
* testsuite/systemtap.base/wakeup.exp: Ditto.
* testsuite/systemtap.base/warn_overflow.exp: Ditto.
* testsuite/systemtap.base/warnings.exp: Ditto.
* testsuite/systemtap.stress/whitelist.exp: Ditto.
* testsuite/systemtap.apps/tcl.exp: Update 'spawn' comment.