Ceph

The librgw2 package supports lua scripting and thus a hard dependency was added for `liblua5.3-dev` and `luarocks`, but this is not ideal.
The first one is not required for plain Lua support, the non-devel package `liblua5.3-0` is enough here and the second one is an optional feature and thus does not have to be a hard-dependency but should rather be just a Suggestion.

Currently, upgrading a Debian installation that has only a few packages installed (like `ceph-common`) to be able to access a Ceph cluster as a client, will result in 65 (!) new packages getting installed, all development related (compiler, automake, autotools, pkgconfig, various libraries, ...).
That is not great, as while (advanced) Lua scripting on RGW requests/response is certainly a nice feature for some setups it's not universally required to have.