bootchartd.in: make sure only one bootchartd process

[Mingli-Yu]

When boot with "init=/sbin/bootchartd", there come two bootchartd process
after boot as below.
 # ps -ef | grep bootchart
root       101     1  0 03:27 ?        00:00:00 /bin/sh /sbin/bootchartd
root       103   101  8 03:27 ?        00:00:02 /lib64/bootchart/bootchart-collector 50
root       106     1  0 03:27 ?        00:00:00 /bin/sh /sbin/bootchartd
root       792   106  0 03:27 ?        00:00:00 /lib64/bootchart/bootchart-collector --usleep 1000000
root       794   725  0 03:27 ttyS0    00:00:00 grep bootchart

 # /sbin/bootchartd stop
[bootchart] bootchart-collector started as pid 596 with 2 args:
[bootchart] '--dump'
[bootchart] '/tmp/bootchart.3lXpVDAq3v'
[bootchart] Extracting profile data from pid 204
[bootchart] map 0xbed9a000 -> 0xbedbb000 size: 132k from 'bed9a000' 'bedbb000'
[bootchart] read 135168 bytes of 135168
[bootchart] reading 150 chunks (of 150) ...
[bootchart] wrote 18760 kbB
[bootchart] bootchart-collector pid: 596 unmounted proc / clean exit

But there still one process exist after the above stop command finish.
 # ps -ef | grep bootchartd
root 202 1 0 09:09 ? 00:00:00 /bin/sh /sbin/bootchartd
root 629 516 0 09:10 ? 00:00:00 grep bootchartd

Remove the wait_boot which used to wait the boot process to finish to
make sure only one bootchartd process and meanwhile we don't need the
wait_boot logic because we can use "/sbin/bootchartd stop" to stop the
bootchartd manually.

After patch:
 # ps -ef | grep bootchart
 root       101     1  0 03:36 ?        00:00:00 /bin/sh /sbin/bootchartd
 root       103   101  6 03:36 ?        00:00:04 /lib64/bootchart/bootchart-collector 50
 root       596   592  0 03:37 ttyS0    00:00:00 grep bootchart

Signed-off-by: Mingli Yu [email protected]