Port changes and tests from ngx_http_lua v0.10.15 and a few from v0.10.16

[thibaultcha]

• Includes the following ports from ngx_http_lua v0.10.15:
  • openresty/lua-nginx-module@53519cd feat: sending nil/bool in cosockets
  • openresty/lua-nginx-module@809192c feat: expose ngx_stream_lua_ffi_str_t type
  • openresty/lua-nginx-module@f64ec8c bugfix: tcpsock:setkeepalive nginx shutdown fix
  • openresty/lua-nginx-module@248060b feature: errors are now logged when timers fail to run.
  • cosocket connection queuing
  • openresty/lua-nginx-module@b2af4d3 bugfix: inlined Lua code snippets code cache fix
  • openresty/lua-nginx-module@b5ffb11 feature: implemented the receiveany() upstream cosocket method
• also includes the following ports from ngx_http_lua v0.10.16:
  • openresty/lua-nginx-module@33a5517 bugfix: fixed clang warnings
  • openresty/lua-nginx-module@59b6430 bugfix: fixed LuaJIT current line in logs
  • openresty/lua-nginx-module@09484e8 bugfix: do not mutate another module's main_conf
  • openresty/lua-nginx-module@a96e99a change: only compile with LuaJIT 2.x
  • openresty/lua-nginx-module@60736e6 change: deprecate 'lua_load_resty_core'
  • openresty/lua-nginx-module@947fa00 change: retired old CFunction API
  • openresty/lua-nginx-module@c5135a0 change: removed compat for NGINX cores < 1.6.0
  • openresty/lua-nginx-module@189ba24 feature: log location of timer funcs that fail to run
  • openresty/lua-nginx-module@97431d8 bugfix: fix compilation with NGINX cores < 1.11.11
  • openresty/lua-nginx-module@97f0101 feature: enabled 'ngx.thread' and 'ngx.socket.udp' in ssl_session_fetch_by_lua*
  • openresty/lua-nginx-module@2a19073 change: removed error logging on coroutine runtime errors
  • openresty/lua-nginx-module@9a892b8 bugfix: coroutine.wrap propagate errors to the parent coroutine

Sister PRs:

• Generate ngx_http_lua v0.10.15 and added ports to ngx_stream_lua meta-lua-nginx-module#71
• feature: updated to support ngx_stream_lua without CFunction APIs. lua-resty-core#269
• ngx_stream_lua_module sync lua-nginx-module#1579

[thibaultcha]

Some slight updates to be made for the tests to pass on Travis, will update the PR later.

[thibaultcha]

Merged.