devserver: count apache process correctly

The current devserver RPC check_health returns a confusing
apache_client_count number which includes all process which has string
"apache" in command line. Obviously it was wrong. This CL counts process
more restrictly.

BUG=chromium:960122
TEST=None

Change-Id: I10319a3658ba81600732f7f8d85df568a429da11
Reviewed-on: https://chromium-review.googlesource.com/1604302
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Congbin Guo <guocb@chromium.org>
Reviewed-by: Xixuan Wu <xixuan@chromium.org>
1 file changed