add sub reload() to Nginx.pm of nginx-tests
change sleep time of reload operation to 1 second
Merge pull request #300 from lilbedwin/reload

add sub reload() to Nginx.pm of nginx-tests
Merge branch 'master' of github.com:alibaba/tengine
add english document of consistent_hash module

 * add docs/modules/ngx_http_upstream_consistent_hash_module.md
 * small fix for chinese document of consistent_hash module
add english document for session sticky module
Merge pull request #302 from chobits/session_sticky_document

add english document for session sticky module
Merge pull request #301 from chobits/consistent_hash_doc

add english document of consistent_hash module
Merge branch 'master' of github.com:alibaba/tengine
modify test cases of upstream_check_module for the persistent connection