perf tools: Add 'stop' control command

Adding control 'stop' command to stop perf record.

When it is received, perf will set the 'done' variable to 1 to stop its
mmap ring buffer reading loop.

Example session:

  terminal 1:
    # mkfifo control ack
    # perf record --control=fifo:control,ack

  terminal 2:
    # echo stop > control

  terminal 1:
    [ perf record: Woken up 7 times to write data ]
    [ perf record: Captured and wrote 3.214 MB perf.data (38280 samples) ]
    #

Signed-off-by: Jiri Olsa <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Alexei Budankov <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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