mod_storage_sql: Be more specific when checking for old index in SQLite3
Prevents false positives in the odd case where something other than an
index with this name might exist.
For full information on our dependencies, version requirements, and
where to find them, see https://prosody.im/doc/depends
If you have luarocks available on your platform, install the following:
- luaexpat
- luasocket
- luafilesystem
- luasec