Merge pull request #2 from yzprofile/dynamic_upstream_check

fixed useless variable
added the patch of unique
Merge remote-tracking branch 'origin/dynamic_upstream_check' into dynamic_upstream_check
recover the status in the check_http_expect_alive directive
Merge remote-tracking branch 'taobao/master' into dynamic_upstream_check
fixed the possible the timer bug
Merge branch 'develop' into dynamic_upstream_check
remove the shared memory clear code
fixed the bugs with dynamic check servers
fixed the wrong index of peer
Merge remote-tracking branch 'yaoweibin/dynamic_upstream_check' into dynamic_upstream_check
fixed the bug of wrong number of shared memory peer
Merge remote-tracking branch 'yaoweibin/dynamic_upstream_check' into dynamic_upstream_check
Fixed: array_push caused upstream'repeat