Fix MI/async testsuite

[Vladimir Prus]

My previous patches to add =thread-created have broken MI testsuite
in async mode, since in async mode, the order of output is somewhat
different and the output for -exec-run is:

  ^running
  =thread-created
  (gdb)

with =thread-creating going before prompt, while in sync mode 
(gdb) follows ^running immediately.

Fixed thusly.

- Volodya

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