mod_client_management: Use grant id from key This is a minor tweak - it's faster and preserves compatibility with older data formats (that we don't necessarily want to be compatible with, but some of us have messy data stores and it pays to be a little more robust).

This module produces more detailed HTTP logs for Prosodys built-in HTTP
server. The format is similar to that of Apache and go into Prosodys
normal logs at the `info` level.