tests: Add hack to test only a single storage driver Fixes that LuaDBI being unavailable makes these produce nothing but endless stack overflows in luarocks.

tests: Update storagemanager tests for prosody.* namespace change Part of an attempt to make these tests work again. Previously they would just explode in a million luarocks stack overflows

mod_storage_sql: Spell out missing dependencies Using util.dependencies appeared to cause problems with running tests in Busted, so this also removes that and uses pcall directly.

mod_storage_sql: Pass variables as arguments instead of upvalues Probably a workaround for the lack of argument passing when using xpcall in Lua 5.1, no longer relevant.

util.sql: Remove unused String() and Integer() functions According to MattJ, leftovers from an earlier vision for util.sql

util.sqlite3: Clean up unused variables Many leftovers from the earlier version of util.sql this was based on and cleanup applied there since then.

util.datamanager: Always reset index after list shift Shifting the index does not work reliably yet, better to rebuild it from scratch. Since there is minimal parsing involved in that, it should be more efficient anyway.

core.moduleapi: Parse period min/max arguments Allows specifying them the same way as the default and in the config, for consistency

util.datamanager: Add way to close indexed list store

util.datamanager: Close file handle when done using it It gets closed eventually but at high load they could potentially lead to reaching FD limits faster.