No LuaRocks module found for kong.plugins.opentracing-lua.handler

```
2020/06/08 10:56:44 [error] 1#0: init_by_lua error: /usr/local/share/lua/5.1/kong/init.lua:463: error loading plugin schemas: on plugin 'opentracing-lua': opentracing-lua plugin is enabled but not installed;
module 'kong.plugins.opentracing-lua.handler' not found:No LuaRocks module found for kong.plugins.opentracing-lua.handler
no field package.preload['kong.plugins.opentracing-lua.handler']
no file '/opt/kong/plugins/opentracing-lua/handler.lua'
no file '/usr/local/openresty/site/lualib/kong/plugins/opentracing-lua/handler.ljbc'
no file '/usr/local/openresty/site/lualib/kong/plugins/opentracing-lua/handler/init.ljbc'
no file '/usr/local/openresty/lualib/kong/plugins/opentracing-lua/handler.ljbc'
no file '/usr/local/openresty/lualib/kong/plugins/opentracing-lua/handler/init.ljbc'
no file '/usr/local/openresty/site/lualib/kong/plugins/opentracing-lua/handler.lua'
no file '/usr/local/openresty/site/lualib/kong/plugins/opentracing-lua/handler/init.lua'
no file '/usr/local/openresty/lualib/kong/plugins/opentracing-lua/handler.lua'
no file '/usr/local/openresty/lualib/kong/plugins/opentracing-lua/handler/init.lua'
no file './kong/plugins/opentracing-lua/handler.lua'
no file '/usr/local/openresty/luajit/share/luajit-2.1.0-beta3/kong/plugins/opentracing-lua/handler.lua'
no file '/usr/local/share/lua/5.1/kong/plugins/opentracing-lua/handler.lua'
no file '/usr/local/share/lua/5.1/kong/plugins/opentracing-lua/handler/init.lua'
no file '/usr/local/openresty/luajit/share/lua/5.1/kong/plugins/opentracing-lua/handler.lua'
no file '/usr/local/openresty/luajit/share/lua/5.1/kong/plugins/opentracing-lua/handler/init.lua'
no file '/home/kong/.luarocks/share/lua/5.1/kong/plugins/opentracing-lua/handler.lua'
no file '/home/kong/.luarocks/share/lua/5.1/kong/plugins/opentracing-lua/handler/init.lua'
no file '/usr/local/openresty/site/lualib/kong/plugins/opentracing-lua/handler.so'
no file '/usr/local/openresty/lualib/kong/plugins/opentracing-lua/handler.so'
no file './kong/plugins/opentracing-lua/handler.so'
no file '/usr/local/lib/lua/5.1/kong/plugins/opentracing-lua/handler.so'
no file '/usr/local/openresty/luajit/lib/lua/5.1/kong/plugins/opentracing-lua/handler.so'
no file '/usr/local/lib/lua/5.1/loadall.so'
no file '/home/kong/.luarocks/lib/lua/5.1/kong/plugins/opentracing-lua/handler.so'
no file '/usr/local/openresty/site/lualib/kong.so'
no file '/usr/local/openresty/lualib/kong.so'
no file './kong.so'
no file '/usr/local/lib/lua/5.1/kong.so'
no file '/usr/local/openresty/luajit/lib/lua/5.1/kong.so'
no file '/usr/local/lib/lua/5.1/loadall.so'
no file '/home/kong/.luarocks/lib/lua/5.1/kong.so'
stack traceback:
[C]: in function 'assert'
/usr/local/share/lua/5.1/kong/init.lua:463: in function 'init'
init_by_lua:3: in main chunk
```
How can I install missing module?
#Kubernetes #kong1.4 #dbless

Start at kong/init.lua:463 and inspect the reported Lua module lookup paths, especially /opt/kong/plugins/opentracing-lua/handler.lua and the LuaRocks locations. Reproduce the Kong 1.4 dbless startup error and determine how the opentracing-lua handler should be installed; done means the plugin loads without the missing-module error.

Written by the indexing model from the issue text.