[WIP] Merge modules updating from nginx 1.15.1

[chobits]

• after merging this pr, diff with nginx-1.15.1 is https://gist.github.com/chobits/1c97d29e453dd17778e02166e479dfcb#diff-with-nginx-1151
• Update modules that is independent with nginx core:

ngx_http_access_module
ngx_http_auth_basic_module
ngx_http_auth_request_module
ngx_http_autoindex_module
ngx_http_charset_filter_module
ngx_http_index_module
ngx_http_limit_conn_module
ngx_http_flv_module
ngx_http_geo_module
ngx_http_map_module
ngx_http_not_modified_filter_module
ngx_http_xslt_filter_module
ngx_http_random_index_module
ngx_http_sub_filter_module
ngx_http_mp4_module
ngx_http_gzip_filter_module
ngx_http_static_module
ngx_http_referer_module
ngx_http_userid_filter_module

• Also update test cases:

Nginx.pm  -- nginx test case library

auth_basic.t
autoindex_format.t
charset_gzip_static.t
limit_conn.t
geo.t
gunzip_*.t
map_*.t
not_modified*.t
xslt_params.t
sub_filter*.t
range_mp4.t
index2.t
referer.t
userid.t

---

• Test case log: https://gist.github.com/chobits/1c97d29e453dd17778e02166e479dfcb
• Case failure:
  • sub_filter_slice.t: current tengine has its slice module, so this case is not run for nginx module.
  • limit_conn_complex.t: limit_req module is not updated.
  • index2.t: current tengine does not merge http://hg.nginx.org/nginx/rev/d91a8c4ac6bb.
  • userid.t: tengine refactor 404 page. It outputs URI in response, the URI has "expires" string, which makes case failed.
• Case fixed:
  • memcached_keepalive.t: fixed this case for Tengine via setting worker_processes 1;

[chobits]

skip failed test case for current Tengine.
When Tengine merged nginx-1.15.x completely, this case will pass.

[chobits]

fixed this case for Tengine.

[wangfakang]

ack.