Fixes https://github.com/emqx/emqx-lua-hook/issues/118
1) If the Lua hook returns an empty list, it should replace the final
topic filter list.
2) The subscribed topics after running the 'client.subscribe' hook
should not contain topics filtered out by the hooks.
emqx_moduels for enterprise is refactored as a lib/plugin
in order to avoid merge conflicts, we make sure they can
co-exist in the same branch, because lib-opensource is compiled
in opensource project and lib-enterprise (to be added) is
compiled in enterprise project
And move emqx app back to root level
After realising the challenges of developing plugins in standalone
rebar projects. it is perhaps more smooth to keep using emqx as
a rebar dependency
Starting from 5.0.0, all apps in apps dir should follow semver
strictly. Do not use the umbrella project's release tags.
The universal tags made sense when we have applications scattered
in different repos. Now since this is an umbrella project, it is
enough to have a single package level version number corelated with
git tag.
Thales Macedo Garitezi